diff --git a/package/prboom/prboom.mk b/package/prboom/prboom.mk
index fc440e5cf8..ab9ab09913 100644
--- a/package/prboom/prboom.mk
+++ b/package/prboom/prboom.mk
@@ -18,6 +18,10 @@ ifeq ($(BR2_TOOLCHAIN_HAS_GCC_BUG_85180),y)
 PRBOOM_CFLAGS += -O0
 endif
 
+ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_15),y)
+PRBOOM_CFLAGS += -std=gnu18
+endif
+
 PRBOOM_CONF_ENV += CFLAGS="$(PRBOOM_CFLAGS)"
 
 ifeq ($(BR2_PACKAGE_LIBPNG),y)