diff --git a/mozilla/modules/libpr0n/build/nsImageModule.cpp b/mozilla/modules/libpr0n/build/nsImageModule.cpp
index d3cbbe38c5e..a16da30b05e 100644
--- a/mozilla/modules/libpr0n/build/nsImageModule.cpp
+++ b/mozilla/modules/libpr0n/build/nsImageModule.cpp
@@ -152,6 +152,7 @@ static const char* gImageMimeTypes[] = {
   "image/x-icon",
   "image/vnd.microsoft.icon",
   "image/bmp",
+  "image/x-ms-bmp",
 #endif
 #ifdef IMG_BUILD_DECODER_png
   "image/png",
@@ -269,6 +270,10 @@ static const nsModuleComponentInfo components[] =
      NS_BMPDECODER_CID,
      "@mozilla.org/image/decoder;2?type=image/bmp",
      nsBMPDecoderConstructor, },
+  { "BMP Decoder",
+     NS_BMPDECODER_CID,
+     "@mozilla.org/image/decoder;2?type=image/x-ms-bmp",
+     nsBMPDecoderConstructor, },
 #endif
 
 #ifdef IMG_BUILD_DECODER_png