diff --git a/Source/cmQtAutoGenerators.cxx b/Source/cmQtAutoGenerators.cxx
index b16eccda3..226ab430e 100644
--- a/Source/cmQtAutoGenerators.cxx
+++ b/Source/cmQtAutoGenerators.cxx
@@ -1104,10 +1104,39 @@ void cmQtAutoGenerators::ParseHeaders(const std::set<std::string>& absHeaders,
         std::cout << "AUTOGEN: Checking " << headerName << std::endl;
         }
 
-      const std::string basename = cmsys::SystemTools::
-                                   GetFilenameWithoutLastExtension(headerName);
+      std::string headerDirectory;
+      if (cmsys::SystemTools::IsSubDirectory(headerName,
+                                             this->ProjectSourceDir))
+        {
+        headerDirectory = this->ProjectSourceDir;
+        }
+      else if (cmsys::SystemTools::IsSubDirectory(headerName,
+                                                  this->ProjectBinaryDir))
+        {
+        headerDirectory = this->ProjectBinaryDir;
+        }
+      else
+        {
+        cmsys::SystemTools::SplitPathRootComponent(headerName,
+                                                   &headerDirectory);
+        }
 
-      const std::string currentMoc = "moc_" + basename + ".cpp";
+      std::string baseHeaderName =
+        cmsys::SystemTools::GetFilenameWithoutLastExtension(headerName);
+
+      headerDirectory = cmsys::SystemTools::RelativePath(
+        headerDirectory, cmsys::SystemTools::GetParentDirectory(headerName));
+
+      if (!headerDirectory.empty())
+        {
+        headerDirectory += "/";
+        }
+
+      std::string mocName = headerDirectory + baseHeaderName;
+
+      cmSystemTools::ReplaceString(mocName, "/", "_");
+
+      const std::string currentMoc = "moc_" + mocName + ".cpp";
       std::string macroName;
       if (requiresMocing(contents, macroName))
         {
diff --git a/Tests/QtAutogen/Adir/CMakeLists.txt b/Tests/QtAutogen/Adir/CMakeLists.txt
index a1c36ffce..0c7848dbb 100644
--- a/Tests/QtAutogen/Adir/CMakeLists.txt
+++ b/Tests/QtAutogen/Adir/CMakeLists.txt
@@ -3,6 +3,6 @@ set(CMAKE_INCLUDE_CURRENT_DIR ON)
 set(CMAKE_AUTOMOC ON)
 set(CMAKE_INCLUDE_CURRENT_DIR_IN_INTERFACE ON)
 
-add_library(libA SHARED libA.cpp)
+add_library(libA SHARED libA.cpp foo.cpp bar/foo.cpp)
 target_link_libraries(libA LINK_PUBLIC ${QT_QTCORE_TARGET})
 generate_export_header(libA)
diff --git a/Tests/QtAutogen/Adir/bar/foo.cpp b/Tests/QtAutogen/Adir/bar/foo.cpp
new file mode 100644
index 000000000..3f5e0a989
--- /dev/null
+++ b/Tests/QtAutogen/Adir/bar/foo.cpp
@@ -0,0 +1,4 @@
+#include "foo.h"
+
+bar::foo::foo() {}
+bar::foo::~foo() {}
diff --git a/Tests/QtAutogen/Adir/bar/foo.h b/Tests/QtAutogen/Adir/bar/foo.h
new file mode 100644
index 000000000..daf23679a
--- /dev/null
+++ b/Tests/QtAutogen/Adir/bar/foo.h
@@ -0,0 +1,10 @@
+#include <QObject>
+
+namespace bar {
+  class foo: public QObject {
+    Q_OBJECT
+  public:
+    foo();
+    ~foo();
+  };
+}
diff --git a/Tests/QtAutogen/Adir/foo.cpp b/Tests/QtAutogen/Adir/foo.cpp
new file mode 100644
index 000000000..86e4d8eec
--- /dev/null
+++ b/Tests/QtAutogen/Adir/foo.cpp
@@ -0,0 +1,4 @@
+#include "foo.h"
+
+foo::foo() {}
+foo::~foo() {}
diff --git a/Tests/QtAutogen/Adir/foo.h b/Tests/QtAutogen/Adir/foo.h
new file mode 100644
index 000000000..a51960c28
--- /dev/null
+++ b/Tests/QtAutogen/Adir/foo.h
@@ -0,0 +1,8 @@
+#include <QObject>
+
+class foo: public QObject {
+  Q_OBJECT
+public:
+  foo();
+  ~foo();
+};