diff --git a/config/default b/config/default
index 835b91df78e58473b49fe87d2417b38668d57d3a..b098139f85056c7c12cdf5452915a41006e2ce59 100755
--- a/config/default
+++ b/config/default
@@ -107,7 +107,7 @@ case "${HOSTNAME}" in
                     --with-zlib=/sw/aix53/zlib-1.2.3 \
                     --with-szlib=/sw/aix53/szip-2.1 \
                     AR="ar -X 64" LDFLAGS="-brtl" FC=xlf_r CC=xlc_r \
-                    CFLAGS="-g -O3 -q64 -qhot -qarch=auto -qtune=auto -DHAVE_MMAP -Dextname" \
+                    CFLAGS="-g -O3 -q64 -qhot -qstrict -qarch=auto -qtune=auto -DHAVE_MMAP -Dextname" \
                     SHELL=/bin/bash
         ;;
     *)