diff --git a/ghc-modern-c-fix.patch b/ghc-modern-c-fix.patch
new file mode 100644
index 0000000..70f31ca
--- /dev/null
+++ b/ghc-modern-c-fix.patch
@@ -0,0 +1,11 @@
+--- a/compiler/GHC/HsToCore/Foreign/Decl.hs
++++ b/compiler/GHC/HsToCore/Foreign/Decl.hs
+@@ -560,7 +560,7 @@ mkFExportCBits dflags c_nm maybe_target arg_htys res_hty is_IO_res_ty cc
+      ,   ppUnless res_hty_is_unit $
+          if libffi
+                   then char '*' <> parens (ffi_cResType <> char '*') <>
+-                       text "resp = cret;"
++                       text "resp = " <> parens ffi_cResType <> text "cret;"
+                   else text "return cret;"
+      , rbrace
+      ]
diff --git a/ghc-modern-c-fix.txt b/ghc-modern-c-fix.txt
deleted file mode 100644
index 70f31ca..0000000
--- a/ghc-modern-c-fix.txt
+++ /dev/null
@@ -1,11 +0,0 @@
---- a/compiler/GHC/HsToCore/Foreign/Decl.hs
-+++ b/compiler/GHC/HsToCore/Foreign/Decl.hs
-@@ -560,7 +560,7 @@ mkFExportCBits dflags c_nm maybe_target arg_htys res_hty is_IO_res_ty cc
-      ,   ppUnless res_hty_is_unit $
-          if libffi
-                   then char '*' <> parens (ffi_cResType <> char '*') <>
--                       text "resp = cret;"
-+                       text "resp = " <> parens ffi_cResType <> text "cret;"
-                   else text "return cret;"
-      , rbrace
-      ]
diff --git a/ghc.spec b/ghc.spec
index 4eb9afc..9777315 100644
--- a/ghc.spec
+++ b/ghc.spec
@@ -155,7 +155,7 @@ Patch41: https://gitlab.haskell.org/ghc/ghc/-/commit/dd38aca95ac25adc9888083669b
 
 # https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org/message/SKVM4NSFZRWUT5MJKBS6IRUXCG3SCD34/
 # https://gitlab.haskell.org/ghc/ghc/-/merge_requests/12079
-Patch42: ghc-modern-c-fix.txt
+Patch42: ghc-modern-c-fix.patch
 
 # https://gitlab.haskell.org/ghc/ghc/-/wikis/platforms