diff --git a/panda/src/movies/Sources.pp b/panda/src/movies/Sources.pp
index adec18e915..f4a2757e0a 100644
--- a/panda/src/movies/Sources.pp
+++ b/panda/src/movies/Sources.pp
@@ -7,7 +7,7 @@
   #define LOCAL_LIBS p3gobj
 
   #define USE_PACKAGES dx9 vorbis
-  #define WIN_SYS_LIBS $[WIN_SYS_LIBS] strmiids.lib
+  #define WIN_SYS_LIBS $[WIN_SYS_LIBS] strmiids.lib winmm.lib
 
   #define COMBINED_SOURCES \
     $[TARGET]_composite1.cxx