diff --git a/libdap.pri b/libdap.pri
index 459a7879683a25037b9104f882ac2e74b54b3177..a19023d390dcae2a2b4f6372d37047475e153816 100644
--- a/libdap.pri
+++ b/libdap.pri
@@ -1,3 +1,6 @@
+QMAKE_CFLAGS_DEBUG = -std=gnu11
+QMAKE_CFLAGS_RELEASE = -std=gnu11
+
 include (core/core.pri)
 include (crypto/crypto.pri)