diff --git a/gfx/thebes/gfxTextRun.cpp b/gfx/thebes/gfxTextRun.cpp
index c39ccd423c37..155dd8892ec1 100644
--- a/gfx/thebes/gfxTextRun.cpp
+++ b/gfx/thebes/gfxTextRun.cpp
@@ -217,7 +217,6 @@ gfxTextRun::SetPotentialLineBreaks(uint32_t aStart, uint32_t aLength,
         if (canBreak && !charGlyphs[i].IsClusterStart()) {
             // This can happen ... there is no guarantee that our linebreaking rules
             // align with the platform's idea of what constitutes a cluster.
-            NS_WARNING("Break suggested inside cluster!");
             canBreak = CompressedGlyph::FLAG_BREAK_TYPE_NONE;
         }
         changed |= charGlyphs[i].SetCanBreakBefore(canBreak);