diff --git a/pkgs/development/compilers/ghc/7.4.2-binary.nix b/pkgs/development/compilers/ghc/7.4.2-binary.nix
index a57aff4d864f..70cd7d21c477 100644
--- a/pkgs/development/compilers/ghc/7.4.2-binary.nix
+++ b/pkgs/development/compilers/ghc/7.4.2-binary.nix
@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     # We have to patch the GMP paths for the integer-gmp package.
      ''
       find . -name integer-gmp.buildinfo \
-          -exec sed -i "s@extra-lib-dirs: @extra-lib-dirs: ${gmp}/lib@" {} \;
+          -exec sed -i "s@extra-lib-dirs: @extra-lib-dirs: ${gmp.out}/lib@" {} \;
      '' + stdenv.lib.optionalString stdenv.isDarwin ''
       find . -name base.buildinfo \
           -exec sed -i "s@extra-lib-dirs: @extra-lib-dirs: ${libiconv}/lib@" {} \;
@@ -64,7 +64,7 @@ stdenv.mkDerivation rec {
       ln -sv "${ncurses.lib}/lib/libncurses.so" "$out/lib/libncurses${stdenv.lib.optionalString stdenv.is64bit "w"}.so.5"
       find . -type f -perm -0100 \
           -exec patchelf --interpreter "$(cat $NIX_CC/nix-support/dynamic-linker)" \
-          --set-rpath "$out/lib:${gmp}/lib" {} \;
+          --set-rpath "$out/lib:${gmp.out}/lib" {} \;
       sed -i "s|/usr/bin/perl|perl\x00        |" ghc-${version}/ghc/stage2/build/tmp/ghc-stage2
       sed -i "s|/usr/bin/gcc|gcc\x00        |" ghc-${version}/ghc/stage2/build/tmp/ghc-stage2
       for prog in ld ar gcc strip ranlib; do
@@ -91,7 +91,7 @@ stdenv.mkDerivation rec {
 
   configurePhase = ''
     ./configure --prefix=$out \
-      --with-gmp-libraries=${gmp}/lib --with-gmp-includes=${gmp}/include \
+      --with-gmp-libraries=${gmp.out}/lib --with-gmp-includes=${gmp}/include \
       ${stdenv.lib.optionalString stdenv.isDarwin "--with-gcc=${./gcc-clang-wrapper.sh}"}
   '';
 
diff --git a/pkgs/development/compilers/ghc/8.0.1.nix b/pkgs/development/compilers/ghc/8.0.1.nix
index 7f337c019531..b262a448d4da 100644
--- a/pkgs/development/compilers/ghc/8.0.1.nix
+++ b/pkgs/development/compilers/ghc/8.0.1.nix
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
 
   configureFlags = [
     "--with-gcc=${stdenv.cc}/bin/cc"
-    "--with-gmp-includes=${gmp}/include" "--with-gmp-libraries=${gmp}/lib"
+    "--with-gmp-includes=${gmp}/include" "--with-gmp-libraries=${gmp.out}/lib"
     "--with-curses-includes=${ncurses}/include" "--with-curses-libraries=${ncurses}/lib"
   ] ++ stdenv.lib.optional stdenv.isDarwin [
     "--with-iconv-includes=${libiconv}/include" "--with-iconv-libraries=${libiconv}/lib"