diff --git a/pkgs/applications/science/math/sage/sage-src.nix b/pkgs/applications/science/math/sage/sage-src.nix
index 57d6c852be8..9351b90680d 100644
--- a/pkgs/applications/science/math/sage/sage-src.nix
+++ b/pkgs/applications/science/math/sage/sage-src.nix
@@ -109,6 +109,13 @@ stdenv.mkDerivation rec {
     # now set the cache dir to be withing the .sage directory. This is not
     # strictly necessary, but keeps us from littering in the user's HOME.
     ./patches/sympow-cache.patch
+
+    # https://trac.sagemath.org/ticket/28472
+    (fetchpatch {
+      name = "eclib-20190909.patch";
+      url = "https://git.sagemath.org/sage.git/patch?id=d27dc479a5772d59e4bc85d805b6ffd595284f1d";
+      sha256 = "1nf1s9y7n30lhlbdnam7sghgaq9nasmv96415gl5jlcf7a3hlxk3";
+    })
   ];
 
   patches = nixPatches ++ bugfixPatches ++ packageUpgradePatches;
diff --git a/pkgs/development/libraries/eclib/default.nix b/pkgs/development/libraries/eclib/default.nix
index 6aaefd8a2cc..765e13fffb9 100644
--- a/pkgs/development/libraries/eclib/default.nix
+++ b/pkgs/development/libraries/eclib/default.nix
@@ -14,7 +14,7 @@ assert withFlint -> flint != null;
 
 stdenv.mkDerivation rec {
   pname = "eclib";
-  version = "20190226"; # upgrade might break the sage interface
+  version = "20190909"; # upgrade might break the sage interface
   # sage tests to run:
   # src/sage/interfaces/mwrank.py
   # src/sage/libs/eclib
@@ -23,7 +23,7 @@ stdenv.mkDerivation rec {
     owner = "JohnCremona";
     repo = pname;
     rev = "v${version}";
-    sha256 = "1910np1xzyjzszay24xn4b81qhpsvhp5aix9vdpknplni2mq8kwb";
+    sha256 = "0y1vdi4120gdw56gg2dn3wh625yr9wpyk3wpbsd25w4lv83qq5da";
   };
   buildInputs = [
     pari