diff --git a/mfbt/double-conversion/utils.h b/mfbt/double-conversion/utils.h
--- a/mfbt/double-conversion/utils.h
+++ b/mfbt/double-conversion/utils.h
@@ -31,15 +31,15 @@
 #include <stdlib.h>
 #include <string.h>
 
-#include <assert.h>
+#include "mozilla/Assertions.h"
 #ifndef ASSERT
-#define ASSERT(condition)      (assert(condition))
+#define ASSERT(condition)      MOZ_ASSERT(condition)
 #endif
 #ifndef UNIMPLEMENTED
-#define UNIMPLEMENTED() (abort())
+#define UNIMPLEMENTED() MOZ_CRASH()
 #endif
 #ifndef UNREACHABLE
-#define UNREACHABLE()   (abort())
+#define UNREACHABLE()   MOZ_CRASH()
 #endif
 
 // Double operations detection based on target architecture.