diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index c666e9c8180..5047fb00d4f 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7502,7 +7502,7 @@ in
   };
 
   ponyc = callPackage ../development/compilers/ponyc {
-    llvm = llvm_39;
+    llvm = llvm_7;
   };
 
   pony-stable = callPackage ../development/compilers/ponyc/pony-stable.nix { };