diff --git a/pkgs/development/python-modules/pyside/gcc6.patch b/pkgs/development/python-modules/pyside/gcc6.patch
new file mode 100644
index 00000000000..440e94508c5
--- /dev/null
+++ b/pkgs/development/python-modules/pyside/gcc6.patch
@@ -0,0 +1,18 @@
+--- Shiboken-1.2.4.org/tests/libsample/simplefile.cpp	2017-08-26 09:06:27.216859143 +0100
++++ Shiboken-1.2.4/tests/libsample/simplefile.cpp	2017-08-26 09:05:40.037029652 +0100
+@@ -90,13 +90,13 @@
+ SimpleFile::exists() const
+ {
+     std::ifstream ifile(p->m_filename);
+-    return ifile;
++    return (bool)ifile;
+ }
+ 
+ bool
+ SimpleFile::exists(const char* filename)
+ {
+     std::ifstream ifile(filename);
+-    return ifile;
++    return (bool)ifile;
+ }
+ 
diff --git a/pkgs/development/python-modules/pyside/shiboken.nix b/pkgs/development/python-modules/pyside/shiboken.nix
index 82a40c96f64..c588bac69cc 100644
--- a/pkgs/development/python-modules/pyside/shiboken.nix
+++ b/pkgs/development/python-modules/pyside/shiboken.nix
@@ -14,6 +14,7 @@ buildPythonPackage rec {
     sha256 = "1536f73a3353296d97a25e24f9554edf3e6a48126886f8d21282c3645ecb96a4";
   };
 
+
   enableParallelBuilding = true;
 
   buildInputs = [ cmake libxml2 libxslt pysideApiextractor pysideGeneratorrunner python sphinx qt4 ];
@@ -23,7 +24,9 @@ buildPythonPackage rec {
     substituteInPlace generator/CMakeLists.txt --replace \
       \"$\{GENERATORRUNNER_PLUGIN_DIR}\" lib/generatorrunner/
   '';
-  patches = if (isPy35 || isPy36) then [ ./shiboken_py35.patch ] else null;
+
+  # gcc6 patch was also sent upstream: https://github.com/pyside/Shiboken/pull/86
+  patches = [ ./gcc6.patch ] ++ (lib.optional (isPy35 || isPy36) ./shiboken_py35.patch);
 
   cmakeFlags = if isPy3k then "-DUSE_PYTHON3=TRUE" else null;