diff --git a/ipc/chromium/src/base/atomicops.h b/ipc/chromium/src/base/atomicops.h
index c78873c4b68f..feca142d3315 100644
--- a/ipc/chromium/src/base/atomicops.h
+++ b/ipc/chromium/src/base/atomicops.h
@@ -45,7 +45,11 @@ typedef int64 Atomic64;
 
 // Use AtomicWord for a machine-sized pointer.  It will use the Atomic32 or
 // Atomic64 routines below, depending on your architecture.
+#if defined(OS_OPENBSD) && !defined(ARCH_CPU_64_BITS)
+typedef Atomic32 AtomicWord;
+#else
 typedef intptr_t AtomicWord;
+#endif
 
 // Atomically execute:
 //      result = *ptr;