diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 850af6d96ac..9bb3cfd2300 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7852,7 +7852,7 @@ in
   }));
 
   # Version 8.x is marked broken on Darwin: https://gist.github.com/GrahamcOfBorg/bef0231b7129681950f03c4ac06781c8.
-  gfortran = if stdenv.isDarwin then gfortran7 else gfortran8;
+  gfortran = if stdenv.isDarwin then gfortran7 else gfortran9;
 
   gfortran48 = wrapCC (gcc48.cc.override {
     name = "gfortran";
@@ -7902,6 +7902,14 @@ in
     profiledCompiler = false;
   });
 
+  gfortran9 = wrapCC (gcc9.cc.override {
+    name = "gfortran";
+    langFortran = true;
+    langCC = false;
+    langC = false;
+    profiledCompiler = false;
+  });
+
   gcj = gcj6;
   gcj6 = wrapCC (gcc6.cc.override {
     name = "gcj";