diff --git a/toolkit/components/osfile/NativeOSFileInternals.cpp b/toolkit/components/osfile/NativeOSFileInternals.cpp
index a674df14e10d..9d54a4f696df 100644
--- a/toolkit/components/osfile/NativeOSFileInternals.cpp
+++ b/toolkit/components/osfile/NativeOSFileInternals.cpp
@@ -114,7 +114,7 @@ struct ScopedArrayBufferContents: public Scoped<ScopedArrayBufferContentsTraits>
   bool Allocate(uint32_t length) {
     dispose();
     ArrayBufferContents& value = rwget();
-    void *ptr = calloc(1, length);
+    void *ptr = js_calloc(1, length);
     if (ptr) {
       value.data = (uint8_t *) ptr;
       value.nbytes = length;