diff --git a/pkgs/by-name/ga/gammu/package.nix b/pkgs/by-name/ga/gammu/package.nix
index 95e6d79598a2..9a112787d3b4 100644
--- a/pkgs/by-name/ga/gammu/package.nix
+++ b/pkgs/by-name/ga/gammu/package.nix
@@ -44,6 +44,11 @@ stdenv.mkDerivation rec {
     cmake
   ];
 
+  cmakeFlags = [
+    # Fix build with CMake 4
+    (lib.cmakeFeature "CMAKE_POLICY_VERSION_MINIMUM" "3.10")
+  ];
+
   strictDeps = true;
 
   buildInputs = [