diff --git a/pkgs/by-name/ii/iio-oscilloscope/package.nix b/pkgs/by-name/ii/iio-oscilloscope/package.nix
index 15a6d16e1973..70fd9d092e5e 100644
--- a/pkgs/by-name/ii/iio-oscilloscope/package.nix
+++ b/pkgs/by-name/ii/iio-oscilloscope/package.nix
@@ -2,6 +2,7 @@
   lib,
   stdenv,
   fetchFromGitHub,
+  fetchpatch,
   cmake,
   pkg-config,
   wrapGAppsHook3,
@@ -31,6 +32,14 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-wCeOLAkrytrBaXzUbNu8z2Ayz44M+b+mbyaRoWHpZYU=";
   };
 
+  patches = [
+    # make sure the sizeof argument to calloc is the second argument.
+    (fetchpatch {
+      url = "https://github.com/analogdevicesinc/iio-oscilloscope/commit/565cade20566d50adec7be191a6dd7b21217f878.patch";
+      hash = "sha256-JeRve3xtWi+EcZR+qZlek+YwAbPB56OYxkFVd8MmIb0=";
+    })
+  ];
+
   postPatch = ''
     # error: 'idx' may be used uninitialized
     substituteInPlace plugins/lidar.c --replace-fail "int i, j, idx;" "int i, j, idx = 0;"