diff --git a/etc/taskcluster/docker/build.dockerfile b/etc/taskcluster/docker/build.dockerfile
index 14f24ae4d8c..5e6966e0885 100644
--- a/etc/taskcluster/docker/build.dockerfile
+++ b/etc/taskcluster/docker/build.dockerfile
@@ -24,6 +24,8 @@ RUN \
         clang \
         llvm \
         llvm-dev \
+        # GStreamer
+        libpcre \
         #
         # OpenSSL
         libssl-dev \