diff --git a/gfx/src/thebes/nsThebesDeviceContext.cpp b/gfx/src/thebes/nsThebesDeviceContext.cpp
index 8d3d9ec51d20..6b64093205aa 100644
--- a/gfx/src/thebes/nsThebesDeviceContext.cpp
+++ b/gfx/src/thebes/nsThebesDeviceContext.cpp
@@ -675,7 +675,13 @@ nsThebesDeviceContext::SetDPI()
             }
         }
 
-        dpi = gfxPlatform::GetDPI();        
+        dpi = gfxPlatform::GetDPI();
+
+#ifdef MOZ_ENABLE_GTK2
+        if (prefDPI < 0) // Clamp the minimum dpi to 96dpi
+            dpi = PR_MAX(dpi, 96);
+#endif
+ 
         if (prefDPI > 0 && !mPrintingSurface)
             dpi = prefDPI;
     }