diff --git a/prism/ext/lpsolve55/src/lp_solve_5.5/lpsolve55/ccc b/prism/ext/lpsolve55/src/lp_solve_5.5/lpsolve55/ccc
index 96fadbd1..4ec2d232 100644
--- a/prism/ext/lpsolve55/src/lp_solve_5.5/lpsolve55/ccc
+++ b/prism/ext/lpsolve55/src/lp_solve_5.5/lpsolve55/ccc
@@ -6,10 +6,10 @@ if [ "$ARCH" = "" ]; then
 	CFLAGS=-m32
 fi
 if [ "$ARCH" = "amd64" ]; then
-	CFLAGS=-m64 -fPIC -DPIC
+	CFLAGS="-m64 -fPIC -DPIC"
 fi
 if [ "$ARCH" = "ia64" ]; then
-	CFLAGS=-fPIC -DPIC
+	CFLAGS="-fPIC -DPIC"
 fi
 
 #determine platform (32/64 bit)