--- a/ipc/chromium/src/base/atomicops_internals_x86_msvc.h
+++ b/ipc/chromium/src/base/atomicops_internals_x86_msvc.h
@@ -41,17 +41,21 @@ inline Atomic32 Barrier_AtomicIncrement(
 
 inline Atomic32 NoBarrier_AtomicIncrement(volatile Atomic32* ptr,
                                           Atomic32 increment) {
   return Barrier_AtomicIncrement(ptr, increment);
 }
 
 inline void MemoryBarrier() {
   // We use MemoryBarrier from WinNT.h
+#ifdef __MINGW32__
+  MemoryBarrier();
+#else
   ::MemoryBarrier();
+#endif
 }
 
 inline Atomic32 Acquire_CompareAndSwap(volatile Atomic32* ptr,
                                        Atomic32 old_value,
                                        Atomic32 new_value) {
   return NoBarrier_CompareAndSwap(ptr, old_value, new_value);
 }