diff --git a/debugger/SkDebugCanvas.cpp b/debugger/SkDebugCanvas.cpp
index b3c54d6..aa4d834 100644
--- a/debugger/SkDebugCanvas.cpp
+++ b/debugger/SkDebugCanvas.cpp
@@ -93,7 +93,7 @@
     return layer;
 }
 
-SkPMColor OverdrawXferModeProc(SkPMColor src, SkPMColor dst) {
+static SkPMColor OverdrawXferModeProc(SkPMColor src, SkPMColor dst) {
     // This table encodes the color progression of the overdraw visualization
     static const SkPMColor gTable[] = {
         SkPackARGB32(0x00, 0x00, 0x00, 0x00),