diff --git a/pkgs/applications/science/math/engauge-digitizer/default.nix b/pkgs/applications/science/math/engauge-digitizer/default.nix
index 37e501bffe7b..db0c64ed1487 100644
--- a/pkgs/applications/science/math/engauge-digitizer/default.nix
+++ b/pkgs/applications/science/math/engauge-digitizer/default.nix
@@ -48,13 +48,15 @@ stdenv.mkDerivation rec {
     "CONFIG+=log4cpp_null"
   ];
 
-  POPPLER_INCLUDE = "${poppler.dev}/include/poppler/qt5";
+  env = {
+    POPPLER_INCLUDE = "${poppler.dev}/include/poppler/qt5";
 
-  POPPLER_LIB = "${poppler}/lib";
+    POPPLER_LIB = "${poppler}/lib";
 
-  OPENJPEG_INCLUDE = "${openjpeg.dev}/include/${openjpeg.pname}-${lib.versions.majorMinor openjpeg.version}";
+    OPENJPEG_INCLUDE = "${openjpeg.dev}/include/${openjpeg.pname}-${lib.versions.majorMinor openjpeg.version}";
 
-  OPENJPEG_LIB = "${openjpeg}/lib";
+    OPENJPEG_LIB = "${openjpeg}/lib";
+  };
 
   installPhase = ''
     runHook preInstall