diff --git a/NTMakefile b/NTMakefile
index a0bc3d79..18fbbda7 100644
--- a/NTMakefile
+++ b/NTMakefile
@@ -1,7 +1,7 @@
 CC = cl /TC /c /nologo
 LD = link /nologo
 
-!if [where /R "%DXSDK_DIR%\\Include" d3d9.h >nul 2>nul]
+!if [where /R "%DXSDK_DIR%\\Include" /Q d3d9.h] == 0
 !if [echo DX9_FLAGS = /DMW_DIRECT3D9 /I"%DXSDK_DIR%\\Include">d3d9flags.mk]
 !endif
 !else
diff --git a/tools/genmk.pl b/tools/genmk.pl
index b7993e39..bc97e84c 100755
--- a/tools/genmk.pl
+++ b/tools/genmk.pl
@@ -44,7 +44,7 @@ sub cobjs {
 
 sub d3d9_detect_block {
     return <<'EOF';
-!if [where /R "%DXSDK_DIR%\\Include" d3d9.h >nul 2>nul]
+!if [where /R "%DXSDK_DIR%\\Include" /Q d3d9.h] == 0
 !if [echo DX9_FLAGS = /DMW_DIRECT3D9 /I"%DXSDK_DIR%\\Include">d3d9flags.mk]
 !endif
 !else