diff --git a/pkgs/development/libraries/zeroc-ice/3.6.nix b/pkgs/development/libraries/zeroc-ice/3.6.nix
index 725af51487c8..f25cfc7c2e1e 100644
--- a/pkgs/development/libraries/zeroc-ice/3.6.nix
+++ b/pkgs/development/libraries/zeroc-ice/3.6.nix
@@ -34,6 +34,8 @@ stdenv.mkDerivation rec {
       sha256 = "17j5r7gsa3izrm7zln4mrp7l16h532gvmpas0kzglybicbiz7d56";
       stripLen = 1;
     })
+    # Fixes compilation warning about uninitialied variables (in test code)
+    ./uninitialized-variable-warning.patch
   ];
 
   preBuild = ''
diff --git a/pkgs/development/libraries/zeroc-ice/uninitialized-variable-warning.patch b/pkgs/development/libraries/zeroc-ice/uninitialized-variable-warning.patch
new file mode 100644
index 000000000000..878dee26bb83
--- /dev/null
+++ b/pkgs/development/libraries/zeroc-ice/uninitialized-variable-warning.patch
@@ -0,0 +1,20 @@
+diff --git a/test/Glacier2/dynamicFiltering/TestControllerI.h b/test/Glacier2/dynamicFiltering/TestControllerI.h
+index 7e21639..1279200 100644
+--- a/test/Glacier2/dynamicFiltering/TestControllerI.h
++++ b/test/Glacier2/dynamicFiltering/TestControllerI.h
+@@ -21,13 +21,12 @@ struct SessionTuple
+ {
+     Glacier2::SessionPrx session;
+     Glacier2::SessionControlPrx sessionControl;
+-    bool configured;
++    bool configured = false;
+
+     SessionTuple() {}
+     SessionTuple(Glacier2::SessionPrx s, Glacier2::SessionControlPrx control):
+         session(s),
+-        sessionControl(control),
+-        configured(false)
++        sessionControl(control)
+     {}
+
+     SessionTuple&