diff --git a/src/win32.mak b/src/win32.mak
index f172dccaf..69e85a537 100644
--- a/src/win32.mak
+++ b/src/win32.mak
@@ -20,7 +20,7 @@ CFG=Debug
 
 ##### Compile flag settings for all build configurations
 
-COMPILE_OPTS=/nologo /W3 /EHsc /D "WIN32" /D "_WINDOWS" /D "_MBCS" /D WINVER=0x0400 /D _WIN32_WINNT=0x0400 /D _CRT_SECURE_NO_DEPRECATE
+COMPILE_OPTS=/nologo /W3 /EHsc /D "WIN32" /D "_WINDOWS" /D "_MBCS" /D WINVER=0x0400 /D _WIN32_WINNT=0x0400 /D _CRT_SECURE_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS
 
 !IF "$(CFG)" == "Release"
 OUTDIR=.\Release
diff --git a/src/winbuild.mak b/src/winbuild.mak
index d357650f4..3c7212dfa 100644
--- a/src/winbuild.mak
+++ b/src/winbuild.mak
@@ -54,10 +54,10 @@ clean:
 	nmake /nologo /f txf.mak MFLAGS=-MD clean CFG=$(CFG)
 	cd ..
 	cd celengine
-	nmake /nologo /f engine.mak MFLAGS=-MD clean CFG=$(CFG)
+	nmake /nologo /f engine.mak MFLAGS=-MD clean CFG=$(CFG) SPICE=$(SPICE) CELX=$(CELX) LUA_VER=$(LUA_VER)
 	cd ..
 	cd celestia
-	nmake /nologo /f celestia.mak MFLAGS=-MD clean CFG=$(CFG)
+	nmake /nologo /f celestia.mak MFLAGS=-MD clean CFG=$(CFG) SPICE=$(SPICE) CELX=$(CELX) LUA_VER=$(LUA_VER)
 	cd ..
 
 always: