diff --git a/prism/ext/lp_solve_5.5_java/lib/build b/prism/ext/lp_solve_5.5_java/lib/build
index a44162d6..2ba9ff8e 100755
--- a/prism/ext/lp_solve_5.5_java/lib/build
+++ b/prism/ext/lp_solve_5.5_java/lib/build
@@ -21,13 +21,13 @@ LPSOLVE_LIB_DIR=../../../lib
 c=g++
 
 if [ "$ARCH" = "" ]; then
-	CFLAGS=-m32
+	CFLAGS="-m32"
 fi
 if [ "$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)