diff --git a/webrtc/typedefs.h b/webrtc/typedefs.h
index 472c74b088..3e3144e858 100644
--- a/webrtc/typedefs.h
+++ b/webrtc/typedefs.h
@@ -48,6 +48,10 @@
 #elif defined(__MIPSEL__)
 #define WEBRTC_ARCH_32_BITS
 #define WEBRTC_ARCH_LITTLE_ENDIAN
+#elif defined(__pnacl__)
+#define WEBRTC_ARCH_32_BITS
+#define WEBRTC_ARCH_LITTLE_ENDIAN
+#define WEBRTC_LITTLE_ENDIAN
 #else
 #error Please add support for your architecture in typedefs.h
 #endif