diff --git a/pkgs/applications/graphics/qtpfsgui/default.nix b/pkgs/applications/graphics/qtpfsgui/default.nix
index 5223ae14c63..1a97df22342 100644
--- a/pkgs/applications/graphics/qtpfsgui/default.nix
+++ b/pkgs/applications/graphics/qtpfsgui/default.nix
@@ -18,7 +18,7 @@ stdenv.mkDerivation rec {
   qmakeFlags = [
     "EXIV2PATH=${exiv2}/include/exiv2"
     "OPENEXRDIR=${openexr}/include/OpenEXR"
-    "FFTW3DIR=${fftwSinglePrec}/include"
+    "FFTW3DIR=${fftwSinglePrec.dev}/include"
     "LIBTIFFDIR=${libtiff}/include"
   ];
 
diff --git a/pkgs/games/scorched3d/default.nix b/pkgs/games/scorched3d/default.nix
index f64f9e38f00..be921bf1189 100644
--- a/pkgs/games/scorched3d/default.nix
+++ b/pkgs/games/scorched3d/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation rec {
 
   sourceRoot = "scorched";
 
-  configureFlags = [ "--with-fftw=${fftwSinglePrec}" ];
+  configureFlags = [ "--with-fftw=${fftwSinglePrec.dev}" ];
 
   NIX_LDFLAGS = [ "-lopenal" ];