diff --git a/cryptest.nmake b/cryptest.nmake
index 0fc1b11a..fd74424b 100644
--- a/cryptest.nmake
+++ b/cryptest.nmake
@@ -47,7 +47,7 @@ RM = del.exe
 # To test Surface RT (ARM tablet), use the following CXXFLAGS:
 #   - /D_ARM_WINAPI_PARTITION_DESKTOP_SDK_AVAILABLE=1 /DWINAPI_FAMILY=WINAPI_FAMILY_DESKTOP_APP
 
-CXXFLAGS = /nologo /W4 /wd4511 /D_MBCS /Zi /TP /EHsc /MD /FI sdkddkver.h /FI winapifamily.h
+CXXFLAGS = /nologo /W4 /wd4511 /D_MBCS /Zi /TP /GR /EHsc /MD /FI sdkddkver.h /FI winapifamily.h
 LDFLAGS = /nologo /SUBSYSTEM:CONSOLE
 ARFLAGS = /nologo
 LDLIBS =