diff --git a/media/webrtc/signaling/test/Makefile.in b/media/webrtc/signaling/test/Makefile.in
index e40fa2047444..81a38ff72f5b 100644
--- a/media/webrtc/signaling/test/Makefile.in
+++ b/media/webrtc/signaling/test/Makefile.in
@@ -97,6 +97,10 @@ LOCAL_INCLUDES += \
  $(NULL)
 
 ifneq ($(OS_TARGET),WINNT)
+ifdef JS_SHARED_LIBRARY
+LIBS += $(MOZ_ZLIB_LIBS)
+endif
+
 CPP_UNIT_TESTS = \
   signaling_unittests.cpp \
   mediapipeline_unittest.cpp \