diff --git a/configure.ac b/configure.ac
index 27c5eb3736..d49f167162 100644
--- a/configure.ac
+++ b/configure.ac
@@ -127,7 +127,7 @@ AC_ARG_WITH([profile],
    [build_profile=${withval}],
    [build_profile=dev])
 
-case "$build_profile" in
+case "${build_profile}" in
    dev|debug|release)
      ;;
    *)