diff --git a/modules/libpr0n/decoders/png/nsPNGDecoder.cpp b/modules/libpr0n/decoders/png/nsPNGDecoder.cpp
index ee973ad94a9a..6f58c6162c76 100644
--- a/modules/libpr0n/decoders/png/nsPNGDecoder.cpp
+++ b/modules/libpr0n/decoders/png/nsPNGDecoder.cpp
@@ -209,7 +209,8 @@ info_callback(png_structp png_ptr, png_infop info_ptr)
   display_exponent = LUT_exponent * CRT_exponent;
 
   if (png_get_gAMA(png_ptr, info_ptr, &aGamma)) {
-      if (info_ptr->gamma < 0)    aGamma = 0.45455;
+      if (aGamma < 0)
+          aGamma = 0.45455;
       png_set_gamma(png_ptr, display_exponent, aGamma);
   }
   else