diff --git a/pkgs/by-name/hd/hdrhistogram_c/package.nix b/pkgs/by-name/hd/hdrhistogram_c/package.nix
index 83aa93951d8e..f05ebfe5f357 100644
--- a/pkgs/by-name/hd/hdrhistogram_c/package.nix
+++ b/pkgs/by-name/hd/hdrhistogram_c/package.nix
@@ -11,13 +11,13 @@
 
 stdenv.mkDerivation (finalAttrs: {
   pname = "hdrhistogram_c";
-  version = "0.11.10";
+  version = "0.11.9";
 
   src = fetchFromGitHub {
     owner = "HdrHistogram";
     repo = "HdrHistogram_c";
     tag = finalAttrs.version;
-    hash = "sha256-LMZj7vuxOA1bgU/J10IKnyNe3R0dk2AA1ydLTHun4vg=";
+    hash = "sha256-9Xp+gPqJpB7xZr5dzyc9Via9gxG9q/EriCx3cm++0kU=";
   };
 
   buildInputs = [ zlib ];