diff --git a/pkgs/by-name/gd/gdb/package.nix b/pkgs/by-name/gd/gdb/package.nix
index fdc6c275d733..95769211d8c2 100644
--- a/pkgs/by-name/gd/gdb/package.nix
+++ b/pkgs/by-name/gd/gdb/package.nix
@@ -231,7 +231,7 @@ stdenv.mkDerivation (finalAttrs: {
 
   meta = {
     description = "GNU Project debugger";
-    mainProgram = "gdb";
+    mainProgram = "${targetPrefix}gdb";
     longDescription = ''
       GDB, the GNU Project debugger, allows you to see what is going
       on `inside' another program while it executes -- or what another