diff --git a/Makefile.msvc b/Makefile.msvc
index 6c7a547..975e894 100644
--- a/Makefile.msvc
+++ b/Makefile.msvc
@@ -8,10 +8,10 @@ BUILDDIR = ../bin/
 CC = cl
 CFLAGS = /nologo /MT /W3 /Ox /GS /EHs- /GA /GF /D "MSVC"  /D "WITH_WSAPOLL" /D "NDEBUG" /D "WIN32" /D "WITH_SSL" /D "_CONSOLE" /D "_MBCS" /D "_WIN32" /D "PRINTF_INT64_MODIFIER=\"I64\"" /Fp"proxy.pch" /FD /c
 !IFDEF VERSION
-CFLAGS = %CFLAGS% /D %VERSION%
+CFLAGS = $CFLAGS /D $VERSION
 !ENDIF
 !IFDEF BUILDDATE
-CFLAGS = %CFLAGS% /D %BUILDDATE%
+CFLAGS = $CFLAGS /D $BUILDDATE
 !ENDIF
 COUT = /Fo
 LN = link
diff --git a/Makefile.msvc64 b/Makefile.msvc64
index 5ed2cb5..7362ed6 100644
--- a/Makefile.msvc64
+++ b/Makefile.msvc64
@@ -10,10 +10,10 @@ BUILDDIR = ../bin64/
 CC = cl
 CFLAGS = /nologo /MT /W3 /Ox /EHs- /GS /GA /GF /D "MSVC"  /D "WITH_SSL" /D "WITH_WSAPOLL" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /D "_WIN32" /D "PRINTF_INT64_MODIFIER=\"I64\"" /Fp"proxy.pch" /FD /c
 !IFDEF VERSION
-CFLAGS = %CFLAGS% /D %VERSION%
+CFLAGS = $CFLAGS /D $VERSION
 !ENDIF
 !IFDEF BUILDDATE
-CFLAGS = %CFLAGS% /D %BUILDDATE%
+CFLAGS = $CFLAGS /D $BUILDDATE
 !ENDIF
 COUT = /Fo
 LN = link
diff --git a/Makefile.msvcARM64 b/Makefile.msvcARM64
index d00a2a4..2b2aba3 100644
--- a/Makefile.msvcARM64
+++ b/Makefile.msvcARM64
@@ -8,10 +8,10 @@ BUILDDIR = ../bin64/
 CC = cl
 CFLAGS = /nologo /MT /W3 /Ox /EHs- /GS /GA /GF /D "MSVC"  /D "WITH_WSAPOLL" /D "WITH_SSL" /D "NDEBUG" /D "WIN32" /D "_CONSOLE" /D "_MBCS" /D "_WIN32" /D "PRINTF_INT64_MODIFIER=\"I64\"" /Fp"proxy.pch" /FD /c
 !IFDEF VERSION
-CFLAGS = %CFLAGS% /D %VERSION%
+CFLAGS = $CFLAGS /D $VERSION
 !ENDIF
 !IFDEF BUILDDATE
-CFLAGS = %CFLAGS% /D %BUILDDATE%
+CFLAGS = $CFLAGS /D $BUILDDATE
 !ENDIF
 COUT = /Fo
 LN = link