diff --git a/prism/ext/lp_solve_5.5_java/lib/build b/prism/ext/lp_solve_5.5_java/lib/build
index 070a6c66..ffa9ef4e 100755
--- a/prism/ext/lp_solve_5.5_java/lib/build
+++ b/prism/ext/lp_solve_5.5_java/lib/build
@@ -28,7 +28,7 @@ fi
 if [ "$ARCH" = "amd64" ]; then
 	CFLAGS = -m64 -fPIC -DPIC
 fi
-if [ "$ARCH" = "" ]; then
+if [ "$ARCH" = "ia64" ]; then
 	CFLAGS = -fPIC -DPIC
 fi
 
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 753497e0..c05d7d87 100644
--- a/prism/ext/lpsolve55/src/lp_solve_5.5/lpsolve55/ccc
+++ b/prism/ext/lpsolve55/src/lp_solve_5.5/lpsolve55/ccc
@@ -8,7 +8,7 @@ fi
 if [ "$ARCH" = "amd64" ]; then
 	CFLAGS = -m64 -fPIC -DPIC
 fi
-if [ "$ARCH" = "" ]; then
+if [ "$ARCH" = "ia64" ]; then
 	CFLAGS = -fPIC -DPIC
 fi