diff --git a/mozilla/modules/libpr0n/build/nsImageModule.cpp b/mozilla/modules/libpr0n/build/nsImageModule.cpp
index a24010bdb93..f6960494f1a 100644
--- a/mozilla/modules/libpr0n/build/nsImageModule.cpp
+++ b/mozilla/modules/libpr0n/build/nsImageModule.cpp
@@ -21,6 +21,15 @@
  *   Stuart Parmenter <pavlov@netscape.com>
  */
 
+#ifdef XP_MAC
+#define IMG_BUILD_gif 1
+#define IMG_BUILD_bmp 1
+#define IMG_BUILD_png 1
+#define IMG_BUILD_jpeg 1
+#define IMG_BUILD_xbm 1
+#define IMG_BUILD_ppm 1
+#endif
+
 #include "nsIGenericFactory.h"
 #include "nsIModule.h"