diff --git a/old-configure b/old-configure
index c57305e409..c216d4f882 100755
--- a/old-configure
+++ b/old-configure
@@ -380,9 +380,11 @@ addcflags() { cflag_check "$@" && OURCFLAGS="$OURCFLAGS $@" ; }
 OURCFLAGS="-std=c99 -Wall $_opt"
 
 addcflags -g -g3 -ggdb
-addcflags -Wundef -Wmissing-prototypes -Wshadow -Wno-switch -Wno-parentheses -Wpointer-arith -Wredundant-decls -Wno-pointer-sign -Werror=implicit-function-declaration -Wno-error=deprecated-declarations -Wno-error=unused-function -Wempty-body
+addcflags -Wundef -Wmissing-prototypes -Wshadow -Wno-switch -Wno-parentheses -Wpointer-arith -Wredundant-decls -Wno-pointer-sign -Werror=implicit-function-declaration -Wno-error=deprecated-declarations -Wno-error=unused-function
 # clang
 addcflags -Wno-logical-op-parentheses -fcolor-diagnostics -Wno-tautological-compare -Wno-tautological-constant-out-of-range-compare
+# extra
+addcflags -Wno-format-zero-length -Wempty-body -Wdisabled-optimization -Wstrict-prototypes
 
 cflag_check -MD -MP && DEPFLAGS="-MD -MP"
 cflag_check -lm && _ld_lm="-lm"
diff --git a/player/command.c b/player/command.c
index c37e45faec..0399905e23 100644
--- a/player/command.c
+++ b/player/command.c
@@ -3698,7 +3698,7 @@ int run_command(MPContext *mpctx, mp_cmd_t *cmd)
         if (opts->osd_level > 0) {
             set_osd_msg(mpctx, osdl, osd_duration, "OSD level: %d", opts->osd_level);
         } else {
-            set_osd_msg(mpctx, 0, 0, "%s", "");
+            set_osd_msg(mpctx, 0, 0, "");
         }
         break;
     }
diff --git a/player/osd.c b/player/osd.c
index f1495a21a9..15cceab95f 100644
--- a/player/osd.c
+++ b/player/osd.c
@@ -422,7 +422,7 @@ static void add_seek_osd_messages(struct MPContext *mpctx)
     if (mpctx->add_osd_seek_info & OSD_SEEK_INFO_TEXT) {
         // Never in term-osd mode
         if (mpctx->video_out && mpctx->opts->term_osd != 1) {
-            if (set_osd_msg(mpctx, 1, mpctx->opts->osd_duration, "%s", ""))
+            if (set_osd_msg(mpctx, 1, mpctx->opts->osd_duration, ""))
                 mpctx->osd_show_pos = true;
         }
     }
diff --git a/waftools/detections/compiler.py b/waftools/detections/compiler.py
index b98218856f..792511af33 100644
--- a/waftools/detections/compiler.py
+++ b/waftools/detections/compiler.py
@@ -38,6 +38,7 @@ def __add_gcc_flags__(ctx):
     __test_and_add_flags__(ctx, ["-Wempty-body"])
     __test_and_add_flags__(ctx, ["-Wdisabled-optimization"])
     __test_and_add_flags__(ctx, ["-Wstrict-prototypes"])
+    __test_and_add_flags__(ctx, ["-Wno-format-zero-length"])
 
 def __add_clang_flags__(ctx):
     ctx.env.CFLAGS += ["-Wno-logical-op-parentheses", "-fcolor-diagnostics",