diff --git a/package/execline/execline.mk b/package/execline/execline.mk
index 842ded6b88..b3d2d98216 100644
--- a/package/execline/execline.mk
+++ b/package/execline/execline.mk
@@ -12,6 +12,7 @@ EXECLINE_INSTALL_STAGING = YES
 EXECLINE_DEPENDENCIES = skalibs
 
 EXECLINE_CONF_OPTS = \
+	CFLAGS="$(TARGET_CFLAGS) -D_GNU_SOURCE" \
 	--prefix=/ \
 	--with-sysdeps=$(STAGING_DIR)/lib/skalibs/sysdeps \
 	--with-include=$(STAGING_DIR)/include \