Index: lib/dfsan/scripts/check_custom_wrappers.sh
===================================================================
--- lib/dfsan/scripts/check_custom_wrappers.sh
+++ lib/dfsan/scripts/check_custom_wrappers.sh
@@ -32,7 +32,7 @@
 
 grep -E __dfsw_ ${DFSAN_CUSTOM_WRAPPERS} \
   | sed "s/.*__dfsw_\([^(]*\).*/\1/" | sort > $DIFF_A
-grep -E "^\\s*test_.*\(\);" ${DFSAN_CUSTOM_TESTS} \
+grep -E "^[[:space:]]*test_.*\(\);" ${DFSAN_CUSTOM_TESTS} \
   | sed "s/.*test_\(.*\)();/\1/" | sort > $DIFF_B
 diff -u $DIFF_A $DIFF_B > ${DIFFOUT}
 if [ $? -ne 0 ]