diff --git a/taskcluster/docker/android-build/Dockerfile b/taskcluster/docker/android-build/Dockerfile
index b1cd9d40d010..42d1086e81b7 100644
--- a/taskcluster/docker/android-build/Dockerfile
+++ b/taskcluster/docker/android-build/Dockerfile
@@ -37,7 +37,6 @@ RUN apt-get update && \
       valgrind \
       vim \
       wget \
-      yasm \
       zip
 
 # Add wrapper scripts for xvfb allowing tasks to easily retry starting up xvfb.
diff --git a/taskcluster/docker/debian-build/Dockerfile b/taskcluster/docker/debian-build/Dockerfile
index 29c628076595..ce34fa4f2705 100644
--- a/taskcluster/docker/debian-build/Dockerfile
+++ b/taskcluster/docker/debian-build/Dockerfile
@@ -71,7 +71,6 @@ RUN apt-get update && \
       wget \
       x11-utils \
       xvfb \
-      yasm \
       zip \
       linux-libc-dev \
       linux-libc-dev:$ARCH \
diff --git a/taskcluster/docker/mingw32-build/Dockerfile b/taskcluster/docker/mingw32-build/Dockerfile
index b6a615de78d5..a4119412de2c 100644
--- a/taskcluster/docker/mingw32-build/Dockerfile
+++ b/taskcluster/docker/mingw32-build/Dockerfile
@@ -36,7 +36,6 @@ RUN apt-get update && \
       wget \
       x11-utils \
       xvfb \
-      yasm \
       zip \
       zlib1g-dev \
       libfreetype6-dev:i386 \
diff --git a/taskcluster/docker/recipes/debian-test-system-setup.sh b/taskcluster/docker/recipes/debian-test-system-setup.sh
index 410c0e874d17..332397861173 100644
--- a/taskcluster/docker/recipes/debian-test-system-setup.sh
+++ b/taskcluster/docker/recipes/debian-test-system-setup.sh
@@ -57,7 +57,6 @@ apt_packages+=('unzip')
 apt_packages+=('uuid')
 apt_packages+=('wget')
 apt_packages+=('xvfb')
-apt_packages+=('yasm')
 apt_packages+=('zip')
 
 # use Ubuntu's Python-2.7 (2.7.3 on Precise)
diff --git a/taskcluster/docker/static-analysis-build/Dockerfile b/taskcluster/docker/static-analysis-build/Dockerfile
index 3fcb1f65fc1c..f03f183de0e4 100644
--- a/taskcluster/docker/static-analysis-build/Dockerfile
+++ b/taskcluster/docker/static-analysis-build/Dockerfile
@@ -51,7 +51,6 @@ RUN apt-get update && \
       uuid \
       valgrind \
       wget \
-      yasm \
       zip \
       zlib1g-dev \
       x11-utils \