diff --git a/mozilla/modules/libpref/src/prefapi.c b/mozilla/modules/libpref/src/prefapi.c
index f627625ba5c..9523bdbb0e2 100644
--- a/mozilla/modules/libpref/src/prefapi.c
+++ b/mozilla/modules/libpref/src/prefapi.c
@@ -522,7 +522,7 @@ PR_IMPLEMENT(void) PREF_Cleanup()
 /* Frees up all the objects except the callback list. */
 PR_IMPLEMENT(void) PREF_CleanupPrefs()
 {
-    gMochaTaskState = NULL; // We -don't- destroy this.
+    gMochaTaskState = NULL; /* We -don't- destroy this. */
 
     if (gMochaContext) {
         gMochaPrefObject = NULL;
diff --git a/mozilla/modules/libpref/src/prefapi.cpp b/mozilla/modules/libpref/src/prefapi.cpp
index f627625ba5c..9523bdbb0e2 100644
--- a/mozilla/modules/libpref/src/prefapi.cpp
+++ b/mozilla/modules/libpref/src/prefapi.cpp
@@ -522,7 +522,7 @@ PR_IMPLEMENT(void) PREF_Cleanup()
 /* Frees up all the objects except the callback list. */
 PR_IMPLEMENT(void) PREF_CleanupPrefs()
 {
-    gMochaTaskState = NULL; // We -don't- destroy this.
+    gMochaTaskState = NULL; /* We -don't- destroy this. */
 
     if (gMochaContext) {
         gMochaPrefObject = NULL;