diff --git a/media-sound/gsm/gsm-1.0.22_p1.ebuild b/media-sound/gsm/gsm-1.0.22_p1.ebuild
index f3a5178d06c97..ee55d2181c5ba 100644
--- a/media-sound/gsm/gsm-1.0.22_p1.ebuild
+++ b/media-sound/gsm/gsm-1.0.22_p1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -38,6 +38,8 @@ src_prepare() {
 }
 
 src_configure() {
+	append-flags -std=gnu17
+
 	# From upstream Makefile. Define this if your host multiplies
 	# floats faster than integers, e.g. on a SPARCstation.
 	use sparc && append-flags -DUSE_FLOAT_MUL -DFAST