diff --git a/package/libdill/libdill.mk b/package/libdill/libdill.mk
index bea9aaeecb..453031a471 100644
--- a/package/libdill/libdill.mk
+++ b/package/libdill/libdill.mk
@@ -13,6 +13,13 @@ LIBDILL_INSTALL_STAGING = YES
 LIBDILL_DEPENDENCIES = host-pkgconf
 LIBDILL_AUTORECONF = YES
 
+# gcc-15 defaults to -std=gnu23 which introduces build failures.
+# We force "-std=gnu17" for gcc version supporting it. Earlier gcc
+# versions will work, since they are using the older standard.
+ifeq ($(BR2_TOOLCHAIN_GCC_AT_LEAST_8),y)
+LIBDILL_CONF_ENV += CFLAGS="$(TARGET_CFLAGS) -std=gnu17"
+endif
+
 ifeq ($(BR2_TOOLCHAIN_HAS_THREADS),y)
 LIBDILL_CONF_OPTS += --enable-threads
 else