diff --git a/pkgs/development/tools/analysis/snowman/default.nix b/pkgs/development/tools/analysis/snowman/default.nix
index 907e44420e9..fba7d3d5cd4 100644
--- a/pkgs/development/tools/analysis/snowman/default.nix
+++ b/pkgs/development/tools/analysis/snowman/default.nix
@@ -1,8 +1,4 @@
-{ stdenv, fetchFromGitHub, cmake, boost, qt4 ? null, qtbase ? null }:
-
-# Only one qt
-assert qt4 != null -> qtbase == null;
-assert qtbase != null -> qt4 == null;
+{ stdenv, fetchFromGitHub, cmake, boost, qtbase }:
 
 stdenv.mkDerivation rec {
   name = "snowman-${version}";
@@ -17,7 +13,7 @@ stdenv.mkDerivation rec {
 
   nativeBuildInputs = [ cmake ];
 
-  buildInputs = [ boost qt4 qtbase ];
+  buildInputs = [ boost qtbase ];
 
   postUnpack = ''
     export sourceRoot=$sourceRoot/src
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index 6811c2a13d8..1ad77d0f98a 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -7868,9 +7868,7 @@ with pkgs;
 
   smc = callPackage ../tools/misc/smc { };
 
-  snowman_qt4 = callPackage ../development/tools/analysis/snowman { };
-  snowman_qt5 = qt5.callPackage ../development/tools/analysis/snowman { qt4 = null; };
-  snowman = snowman_qt5;
+  snowman = qt5.callPackage ../development/tools/analysis/snowman { };
 
   sparse = callPackage ../development/tools/analysis/sparse { };