diff --git a/layout/base/nsPresContext.h b/layout/base/nsPresContext.h
index 8501cdb80fd..bc69bb1874c 100644
--- a/layout/base/nsPresContext.h
+++ b/layout/base/nsPresContext.h
@@ -69,7 +69,6 @@
 #include "nsTArray.h"
 #include "nsAutoPtr.h"
 #include "nsThreadUtils.h"
-#include "nsContentUtils.h"
 
 class nsImageLoader;
 #ifdef IBMBIDI
@@ -1089,8 +1088,6 @@ struct nsAutoLayoutPhase {
         // Once bug 337957 is fixed this should become an NS_ASSERTION
         NS_WARN_IF_FALSE(mPresContext->mLayoutPhaseCount[eLayoutPhase_FrameC] == 0,
                          "recurring into frame construction");
-        NS_ASSERTION(!nsContentUtils::IsSafeToRunScript(),
-                     "constructing frames and scripts are not blocked");
         break;
       default:
         break;