diff --git a/pkgs/development/libraries/libpg_query/default.nix b/pkgs/development/libraries/libpg_query/default.nix
index 59801a029cf4..1335eb3579d7 100644
--- a/pkgs/development/libraries/libpg_query/default.nix
+++ b/pkgs/development/libraries/libpg_query/default.nix
@@ -18,10 +18,7 @@ stdenv.mkDerivation rec {
   installPhase = ''
     install -Dm644 -t $out/lib libpg_query.a
     install -Dm644 -t $out/include pg_query.h
-  '' + lib.optionalString stdenv.isLinux ''
-    install -Dm644 -t $out/lib libpg_query.so
-  '' + lib.optionalString stdenv.isDarwin ''
-    install -Dm644 -t $out/lib libpg_query.dylib
+    install -Dm644 -t $out/lib libpg_query${stdenv.hostPlatform.extensions.sharedLibrary}
   '';
 
   doCheck = true;