diff --git a/mail/imapfilter/Makefile b/mail/imapfilter/Makefile
index e1d939bc4..08a4997ba 100644
--- a/mail/imapfilter/Makefile
+++ b/mail/imapfilter/Makefile
@@ -49,7 +49,7 @@ define Build/Compile
 		$(TARGET_CONFIGURE_OPTS) \
 		INCDIRS="$(TARGET_CPPFLAGS)" \
 		LIBDIRS="$(TARGET_LDFLAGS)" \
-		MYCFLAGS="$(TARGET_CFLAGS)" \
+		MYCFLAGS="$(TARGET_CFLAGS) -std=gnu99" \
 		MYLDFLAGS="-lcrypt" 
 endef
 
diff --git a/net/prosody/Makefile b/net/prosody/Makefile
index a8d59c902..7f8834033 100644
--- a/net/prosody/Makefile
+++ b/net/prosody/Makefile
@@ -50,7 +50,7 @@ endef
 
 define Build/Compile
 	$(call Build/Compile/Default,\
-		CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS)" \
+		CFLAGS="$(TARGET_CFLAGS) $(TARGET_CPPFLAGS) -std=gnu99" \
 		LDFLAGS="$(TARGET_LDFLAGS)" \
 		DESTDIR="$(PKG_INSTALL_DIR)" \
 		PREFIX="/usr" \