diff --git a/winbuild/MakefileBuild.vc b/winbuild/MakefileBuild.vc
index 474557bf5a..0d0a51623c 100644
--- a/winbuild/MakefileBuild.vc
+++ b/winbuild/MakefileBuild.vc
@@ -428,13 +428,13 @@ CFGSET = true
 # CURL_XX macros are for the curl.exe command
 
 !IF "$(DEBUG)"=="yes"
-RC_FLAGS = /dDEBUGBUILD=1 /Fo $@ $(LIBCURL_SRC_DIR)\libcurl.rc
+RC_FLAGS = /d_DEBUG /Fo $@ $(LIBCURL_SRC_DIR)\libcurl.rc
 CURL_CC       = $(CC_DEBUG) $(RTLIB_DEBUG)
-CURL_RC_FLAGS = $(CURL_RC_FLAGS) /i../include /dDEBUGBUILD=1 /Fo $@ $(CURL_SRC_DIR)\curl.rc
+CURL_RC_FLAGS = $(CURL_RC_FLAGS) /i../include /d_DEBUG /Fo $@ $(CURL_SRC_DIR)\curl.rc
 !ELSE
-RC_FLAGS = /dDEBUGBUILD=0 /Fo $@ $(LIBCURL_SRC_DIR)\libcurl.rc
+RC_FLAGS = /Fo $@ $(LIBCURL_SRC_DIR)\libcurl.rc
 CURL_CC       = $(CC_NODEBUG) $(RTLIB)
-CURL_RC_FLAGS = $(CURL_RC_FLAGS) /i../include /dDEBUGBUILD=0 /Fo $@ $(CURL_SRC_DIR)\curl.rc
+CURL_RC_FLAGS = $(CURL_RC_FLAGS) /i../include /Fo $@ $(CURL_SRC_DIR)\curl.rc
 !ENDIF
 
 !IF "$(AS_DLL)" == "true"