diff --git a/gfx/public/nsColor.h b/gfx/public/nsColor.h
index 1a65a3dd9a9f..0b190cc0dc7e 100644
--- a/gfx/public/nsColor.h
+++ b/gfx/public/nsColor.h
@@ -122,7 +122,12 @@ extern "C" NS_GFX_(void) NS_RGB2HSV(nscolor aColor,PRUint16 &aHue,PRUint16 &aSat
 extern "C" NS_GFX_(void) NS_HSV2RGB(nscolor &aColor,PRUint16 aHue,PRUint16 aSat,PRUint16 aValue);
 
 // Gamma correction
-PR_EXPORT_DATA(PRUint8) nsGammaRamp[256], nsInverseGammaRamp[256];
+#ifndef NS_WIN32
+PR_EXPORT_DATA(PRUint8)
+#else
+extern PRUint8
+#endif
+nsGammaRamp[256], nsInverseGammaRamp[256];
 
 extern "C" NS_GFX_(double) NS_DisplayGammaValue(void);
 extern "C" NS_GFX_(void)   NS_InitializeGamma(void);
diff --git a/gfx/src/nsColor.cpp b/gfx/src/nsColor.cpp
index c3e5801ec185..3709f54799c9 100644
--- a/gfx/src/nsColor.cpp
+++ b/gfx/src/nsColor.cpp
@@ -457,7 +457,12 @@ extern "C" NS_GFX_(nscolor) NS_DarkenColor(nscolor inColor)
 
 /* Gamma correction stuff */
 
-PR_IMPLEMENT_DATA(PRUint8) nsGammaRamp[256], nsInverseGammaRamp[256];
+#ifndef NS_WIN32
+PR_IMPLEMENT_DATA(PRUint8)
+#else
+PRUint8
+#endif
+nsGammaRamp[256], nsInverseGammaRamp[256];
 static double  gammaValue = 2.2;
 
 extern "C" NS_GFX_(double) NS_DisplayGammaValue(void)