diff --git a/sc2/build/build.config b/sc2/build/build.config
index 7acba40d5..2a01d5156 100644
--- a/sc2/build/build.config
+++ b/sc2/build/build.config
@@ -141,7 +141,6 @@ CONTENTDIR="${INSTALL_LIBDIR}uqm/content"
 SUBSTITUTE_VARS="$HAVE_SYMBOLS CONTENTDIR"
 SUBSTITUTE_FILES="src/config.h"
 substitute_vars SUBSTITUTE_VARS SUBSTITUTE_FILES
-CFLAGS="$CFLAGS -DHAVE_CONFIG_H"
 
 # Make build.vars from build.vars.in, substituting variables.
 SUBSTITUTE_VARS="CFLAGS LDFLAGS MAKE DEBUG SOUNDMODULE HAVE_OPENGL \