diff --git a/ext/jasmine-webkit-specrunner/extconf.rb b/ext/jasmine-webkit-specrunner/extconf.rb
index b7b2995..ee09069 100644
--- a/ext/jasmine-webkit-specrunner/extconf.rb
+++ b/ext/jasmine-webkit-specrunner/extconf.rb
@@ -1,2 +1,2 @@
-system %{qmake}
+system %{qmake -spec macx-g++}
 system %{make}
diff --git a/ext/jasmine-webkit-specrunner/specrunner.pro b/ext/jasmine-webkit-specrunner/specrunner.pro
index 409c8b4..78cddcb 100644
--- a/ext/jasmine-webkit-specrunner/specrunner.pro
+++ b/ext/jasmine-webkit-specrunner/specrunner.pro
@@ -4,3 +4,4 @@ TARGET = jasmine-webkit-specrunner
 SOURCES = specrunner.cpp
 QT += network webkit
 QMAKE_INFO_PLIST = Info.plist
+QMAKESPEC = macx-gcc