diff --git a/.gitmodules b/.gitmodules
index 2a511c26777..7895365bc7d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -121,3 +121,6 @@
 [submodule "src/support/phf/rust-phf"]
 	path = src/support/phf/rust-phf
 	url = https://github.com/mozilla-servo/rust-phf.git
+[submodule "src/support/stringcache/string-cache"]
+	path = src/support/stringcache/string-cache
+	url = https://github.com/mozilla-servo/string-cache.git
diff --git a/configure b/configure
index bcc5492c067..5b22b0c159f 100755
--- a/configure
+++ b/configure
@@ -523,7 +523,8 @@ CFG_SUBMODULES="\
     support/layers/rust-layers \
     support/opengles/rust-opengles \
     support/sharegl/sharegl \
-    support/phf/rust-phf"
+    support/phf/rust-phf \
+    support/stringcache/string-cache"
 
 if [ $CFG_OSTYPE = "apple-darwin" ]
 then
diff --git a/src/support/stringcache/string-cache b/src/support/stringcache/string-cache
new file mode 160000
index 00000000000..00caade7269
--- /dev/null
+++ b/src/support/stringcache/string-cache
@@ -0,0 +1 @@
+Subproject commit 00caade726945dd8a7bbe81d4f8e77c0177d8ee3