diff --git a/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp b/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp
index 7cecf11aa1f..a9d6ac28d2f 100644
--- a/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp
+++ b/mozilla/modules/plugin/base/src/nsPluginHostImpl.cpp
@@ -1762,7 +1762,7 @@ static int CompareExtensions(const char *aExtensionList, const char *aExtension)
     return -1;
 
   const char *pExt = aExtensionList;
-  char *pComma = strchr(pExt, ',');
+  const char *pComma = strchr(pExt, ',');
 
   if(pComma == nsnull)
     return strcmp(pExt, aExtension);
diff --git a/mozilla/modules/plugin/nglsrc/nsPluginHostImpl.cpp b/mozilla/modules/plugin/nglsrc/nsPluginHostImpl.cpp
index 7cecf11aa1f..a9d6ac28d2f 100644
--- a/mozilla/modules/plugin/nglsrc/nsPluginHostImpl.cpp
+++ b/mozilla/modules/plugin/nglsrc/nsPluginHostImpl.cpp
@@ -1762,7 +1762,7 @@ static int CompareExtensions(const char *aExtensionList, const char *aExtension)
     return -1;
 
   const char *pExt = aExtensionList;
-  char *pComma = strchr(pExt, ',');
+  const char *pComma = strchr(pExt, ',');
 
   if(pComma == nsnull)
     return strcmp(pExt, aExtension);