diff --git a/qmake/generators/mac/pbuilder_pbx.cpp b/qmake/generators/mac/pbuilder_pbx.cpp
index 42580b2..b8b10ad 100644
--- a/qmake/generators/mac/pbuilder_pbx.cpp
+++ b/qmake/generators/mac/pbuilder_pbx.cpp
@@ -542,7 +542,7 @@ ProjectBuilderMakefileGenerator::writeMakeParts(QTextStream &t)
           << "\t\t\t" << writeSettings("name", "Qt Qmake") << ";" << "\n"
           << "\t\t\t" << writeSettings("neededFileNames", QStringList(), SettingsAsList, 4) << ";" << "\n"
           << "\t\t\t" << writeSettings("shellPath", "/bin/sh") << ";" << "\n"
-          << "\t\t\t" << writeSettings("shellScript", fixForOutput("make -C " + escapeFilePath(qmake_getpwd()) + " -f " + escapeFilePath(mkfile))) << ";" << "\n"
+          << "\t\t\t" << writeSettings("shellScript", fixForOutput("make -C " + escapeFilePath(qmake_getpwd()) + " -f '" + escapeFilePath(mkfile) + "'")) << ";" << "\n"
           << "\t\t" << "};" << "\n";
     }
 
@@ -791,7 +791,7 @@ ProjectBuilderMakefileGenerator::writeMakeParts(QTextStream &t)
           << "\t\t\t" << writeSettings("name", "Qt Preprocessors") << ";" << "\n"
           << "\t\t\t" << writeSettings("neededFileNames", fixListForOutput("QMAKE_PBX_OBJ"), SettingsAsList, 4) << ";" << "\n"
           << "\t\t\t" << writeSettings("shellPath", "/bin/sh") << ";" << "\n"
-          << "\t\t\t" << writeSettings("shellScript", fixForOutput("make -C " + escapeFilePath(qmake_getpwd()) + " -f " + escapeFilePath(mkfile))) << ";" << "\n"
+          << "\t\t\t" << writeSettings("shellScript", fixForOutput("make -C " + escapeFilePath(qmake_getpwd()) + " -f '" + escapeFilePath(mkfile) + "'")) << ";" << "\n"
           << "\t\t" << "};" << "\n";
    }
 
@@ -970,7 +970,7 @@ ProjectBuilderMakefileGenerator::writeMakeParts(QTextStream &t)
           << "\t\t\t" << writeSettings("name", "Qt Sublibs") << ";" << "\n"
           << "\t\t\t" << writeSettings("neededFileNames", QStringList(), SettingsAsList, 4) << ";" << "\n"
           << "\t\t\t" << writeSettings("shellPath", "/bin/sh") << "\n"
-          << "\t\t\t" << writeSettings("shellScript", fixForOutput("make -C " + escapeFilePath(qmake_getpwd()) + " -f " + escapeFilePath(mkfile))) << ";" << "\n"
+          << "\t\t\t" << writeSettings("shellScript", fixForOutput("make -C " + escapeFilePath(qmake_getpwd()) + " -f '" + escapeFilePath(mkfile) + "'")) << ";" << "\n"
           << "\t\t" << "};" << "\n";
     }
     //LIBRARY BUILDPHASE