diff --git a/com.ibm.wala.cast/source/c/cbuild.sh b/com.ibm.wala.cast/source/c/cbuild.sh
index 65596dc83..fd6a5f7f0 100644
--- a/com.ibm.wala.cast/source/c/cbuild.sh
+++ b/com.ibm.wala.cast/source/c/cbuild.sh
@@ -1,7 +1,8 @@
 #!/bin/bash
 
-C_DIR=`realpath $0`
-CAST_DIR=`realpath $C_DIR/../../..`
+SCRIPT=`realpath $0`
+C_DIR=`dirname $SCRIPT`
+CAST_DIR=`realpath $C_DIR/../..`
 
 pushd $CAST_DIR/source/c