diff --git a/pkgs/by-name/gd/gdbm/package.nix b/pkgs/by-name/gd/gdbm/package.nix
index 8edf67ea8926..45707a5a4d4b 100644
--- a/pkgs/by-name/gd/gdbm/package.nix
+++ b/pkgs/by-name/gd/gdbm/package.nix
@@ -19,6 +19,7 @@ stdenv.mkDerivation (finalAttrs: {
     # Remove on next release.
     ./upstream-darwin-clock-nanosleep-fix.patch
     ./upstream-lockwait-test-fixes.patch
+    ./upstream-musl-ssize_t-fix.patch
   ];
 
   nativeBuildInputs = [ updateAutotoolsGnuConfigScriptsHook ];
diff --git a/pkgs/by-name/gd/gdbm/upstream-musl-ssize_t-fix.patch b/pkgs/by-name/gd/gdbm/upstream-musl-ssize_t-fix.patch
new file mode 100644
index 000000000000..79f5b3b16eef
--- /dev/null
+++ b/pkgs/by-name/gd/gdbm/upstream-musl-ssize_t-fix.patch
@@ -0,0 +1,25 @@
+From 39ef0347f78ef691c9ad815360198f577043ce4c Mon Sep 17 00:00:00 2001
+From: Sergey Poznyakoff <gray@gnu.org>
+Date: Mon, 24 Mar 2025 07:56:00 +0200
+Subject: Add missing include
+
+* tools/gdbmapp.h: Include sys/types.h
+---
+ tools/gdbmapp.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/tools/gdbmapp.h b/tools/gdbmapp.h
+index 3ea826b..e20253a 100644
+--- a/tools/gdbmapp.h
++++ b/tools/gdbmapp.h
+@@ -16,6 +16,7 @@
+ 
+ #include <stdlib.h>
+ #include <stdarg.h>
++#include <sys/types.h>
+ #include "gettext.h"
+ #ifdef HAVE_LOCALE_H
+ # include <locale.h>
+-- 
+cgit v1.1
+