diff --git a/osrng.cpp b/osrng.cpp
index 5f8f1639..f59853cd 100644
--- a/osrng.cpp
+++ b/osrng.cpp
@@ -14,7 +14,7 @@
 # pragma message("WARNING: Compiling for Windows but an OS RNG is not available. This is likely a Windows Phone 8 or Windows Store 8 app.")
 #endif
 
-#if !defined(OS_NO_DEPENDENCE) && defined(OS_RNG_AVAILABLE)
+#if !defined(NO_OS_DEPENDENCE) && defined(OS_RNG_AVAILABLE)
 
 #include "osrng.h"
 #include "rng.h"
diff --git a/osrng.h b/osrng.h
index a8dff745..4739e334 100644
--- a/osrng.h
+++ b/osrng.h
@@ -8,7 +8,7 @@
 
 #include "config.h"
 
-#if !defined(OS_NO_DEPENDENCE) && defined(OS_RNG_AVAILABLE)
+#if !defined(NO_OS_DEPENDENCE) && defined(OS_RNG_AVAILABLE)
 
 #include "cryptlib.h"
 #include "randpool.h"