diff --git a/components/layout/block.rs b/components/layout/block.rs
index 06a8c390630..40ab4fc4fc1 100644
--- a/components/layout/block.rs
+++ b/components/layout/block.rs
@@ -40,6 +40,7 @@ use flow::{ImmutableFlowUtils, LateAbsolutePositionInfo, MutableFlowUtils, Opaqu
 use flow::{LAYERS_NEEDED_FOR_DESCENDANTS, NEEDS_LAYER};
 use flow::{PostorderFlowTraversal, PreorderFlowTraversal, mut_base};
 use flow::{self, BaseFlow, EarlyAbsolutePositionInfo, ForceNonfloatedFlag, FlowClass, Flow};
+use flow_ref;
 use fragment::{CoordinateSystem, Fragment, FragmentBorderBoxIterator, HAS_LAYER};
 use fragment::{SpecificFragmentInfo};
 use incremental::{REFLOW, REFLOW_OUT_OF_FLOW};
@@ -494,6 +495,20 @@ impl<'a> PostorderFlowTraversal for AbsoluteStoreOverflowTraversal<'a> {
             }
         }
 
+        flow.mutate_fragments(&mut |f: &mut Fragment| {
+            match f.specific {
+                SpecificFragmentInfo::InlineBlock(ref mut info) => {
+                    let block = flow_ref::deref_mut(&mut info.flow_ref);
+                    (block.as_mut_block() as &mut Flow).early_store_overflow(self.layout_context);
+                }
+                SpecificFragmentInfo::InlineAbsolute(ref mut info) => {
+                    let block = flow_ref::deref_mut(&mut info.flow_ref);
+                    (block.as_mut_block() as &mut Flow).early_store_overflow(self.layout_context);
+                }
+                _ => (),
+            }
+        });
+
         flow.early_store_overflow(self.layout_context);
     }
 }
diff --git a/components/layout/flow.rs b/components/layout/flow.rs
index b4a457b341f..51321e75b2c 100644
--- a/components/layout/flow.rs
+++ b/components/layout/flow.rs
@@ -953,10 +953,11 @@ unsafe impl Sync for BaseFlow {}
 impl fmt::Debug for BaseFlow {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         write!(f,
-               "@ {:?}, CC {}, ADC {}",
+               "@ {:?}, CC {}, ADC {}, Ovr {:?}",
                self.position,
                self.parallel.children_count.load(Ordering::SeqCst),
-               self.abs_descendants.len())
+               self.abs_descendants.len(),
+               self.overflow)
     }
 }
 
diff --git a/components/layout/fragment.rs b/components/layout/fragment.rs
index 924f3eaf80f..a7ab373afdb 100644
--- a/components/layout/fragment.rs
+++ b/components/layout/fragment.rs
@@ -2179,11 +2179,11 @@ impl Fragment {
         match self.specific {
             SpecificFragmentInfo::InlineBlock(ref info) => {
                 let block_flow = info.flow_ref.as_block();
-                overflow = overflow.union(&block_flow.compute_overflow());
+                overflow = overflow.union(&flow::base(block_flow).overflow);
             }
             SpecificFragmentInfo::InlineAbsolute(ref info) => {
                 let block_flow = info.flow_ref.as_block();
-                overflow = overflow.union(&block_flow.compute_overflow());
+                overflow = overflow.union(&flow::base(block_flow).overflow);
             }
             _ => (),
         }
diff --git a/components/layout/inline.rs b/components/layout/inline.rs
index 5b137ceade2..00043037f9d 100644
--- a/components/layout/inline.rs
+++ b/components/layout/inline.rs
@@ -8,7 +8,7 @@ use block::{AbsoluteAssignBSizesTraversal, AbsoluteStoreOverflowTraversal};
 use context::LayoutContext;
 use display_list_builder::{FragmentDisplayListBuilding, InlineFlowDisplayListBuilding};
 use floats::{FloatKind, Floats, PlacementInfo};
-use flow::{MutableFlowUtils, OpaqueFlow};
+use flow::{MutableFlowUtils, EarlyAbsolutePositionInfo, OpaqueFlow};
 use flow::{self, BaseFlow, FlowClass, Flow, ForceNonfloatedFlag, IS_ABSOLUTELY_POSITIONED};
 use flow_ref;
 use fragment::{CoordinateSystem, Fragment, FragmentBorderBoxIterator, SpecificFragmentInfo};
@@ -1616,6 +1616,31 @@ impl Flow for InlineFlow {
                                                     Au(0),
                                                     -self.base.position.size.block));
 
+        let containing_block_size = LogicalSize::new(writing_mode,
+                                                    Au(0),
+                                                    self.base.position.size.block);
+        self.mutate_fragments(&mut |f: &mut Fragment| {
+            match f.specific {
+                SpecificFragmentInfo::InlineBlock(ref mut info) => {
+                    let block = flow_ref::deref_mut(&mut info.flow_ref);
+                    flow::mut_base(block).early_absolute_position_info = EarlyAbsolutePositionInfo {
+                        relative_containing_block_size: containing_block_size,
+                        relative_containing_block_mode: writing_mode,
+                    };
+                    (block.as_mut_block() as &mut Flow).late_store_overflow(layout_context);
+                }
+                SpecificFragmentInfo::InlineAbsolute(ref mut info) => {
+                    let block = flow_ref::deref_mut(&mut info.flow_ref);
+                    flow::mut_base(block).early_absolute_position_info = EarlyAbsolutePositionInfo {
+                        relative_containing_block_size: containing_block_size,
+                        relative_containing_block_mode: writing_mode,
+                    };
+                    (block.as_mut_block() as &mut Flow).late_store_overflow(layout_context);
+                }
+                _ => (),
+            }
+        });
+
         self.base.restyle_damage.remove(REFLOW_OUT_OF_FLOW | REFLOW);
     }
 
@@ -1817,7 +1842,11 @@ impl Flow for InlineFlow {
 
 impl fmt::Debug for InlineFlow {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "{:?} - {:x} - {:?}", self.class(), self.base.debug_id(), self.fragments)
+        write!(f, "{:?} - {:x} - Ovr {:?} - {:?}",
+            self.class(),
+            self.base.debug_id(),
+            flow::base(self).overflow,
+            self.fragments)
     }
 }
 
diff --git a/tests/ref/basic.list b/tests/ref/basic.list
index c78d1452c9d..f862cf80d30 100644
--- a/tests/ref/basic.list
+++ b/tests/ref/basic.list
@@ -274,6 +274,7 @@ flaky_cpu == linebreak_simple_a.html linebreak_simple_b.html
 # Should be ==?
 != overflow_position_abs_inside_normal_a.html overflow_position_abs_inside_normal_b.html
 == overflow_position_abs_simple_a.html overflow_position_abs_simple_b.html
+== overflow_position_rel_inline_block.html overflow_position_rel_inline_block_ref.html
 == overflow_scroll.html overflow_simple_b.html
 == overflow_simple_a.html overflow_simple_b.html
 == overflow_wrap_a.html overflow_wrap_ref.html
diff --git a/tests/ref/overflow_position_rel_inline_block.html b/tests/ref/overflow_position_rel_inline_block.html
new file mode 100644
index 00000000000..6aea81b8abe
--- /dev/null
+++ b/tests/ref/overflow_position_rel_inline_block.html
@@ -0,0 +1,11 @@
+<style>
+  div {
+    overflow:hidden;
+    display:inline-block;
+    position:relative;
+    width:100px;
+    height:100px;
+    background:red
+  }
+</style>
+<div></div>
diff --git a/tests/ref/overflow_position_rel_inline_block_ref.html b/tests/ref/overflow_position_rel_inline_block_ref.html
new file mode 100644
index 00000000000..c4f0ec97cb0
--- /dev/null
+++ b/tests/ref/overflow_position_rel_inline_block_ref.html
@@ -0,0 +1,9 @@
+<style>
+  div {
+    position:relative;
+    width:100px;
+    height:100px;
+    background:red
+  }
+</style>
+<div></div>