diff --git a/qrenderdoc/CMakeLists.txt b/qrenderdoc/CMakeLists.txt
index b17e162e0..9fd65b2d3 100644
--- a/qrenderdoc/CMakeLists.txt
+++ b/qrenderdoc/CMakeLists.txt
@@ -1,7 +1,11 @@
 option(STATIC_QRENDERDOC "Compile qrenderdoc as static" OFF)
 option(QRENDERDOC_NO_CXX11_REGEX "Disable C++11 regex in scintilla" OFF)
 
-set(QMAKE_QT5_COMMAND qmake CACHE STRING "Command to run to invoke Qt5's qmake. Normally this is qmake, possibly with qtchooser, but might be qmake-qt5")
+if( NOT DEFINED QT_QMAKE_EXECUTABLE )
+    set( QT_QMAKE_EXECUTABLE "qmake" )
+endif()
+
+set(QMAKE_QT5_COMMAND ${QT_QMAKE_EXECUTABLE} CACHE STRING "Command to run to invoke Qt5's qmake. Normally this is qmake, possibly with qtchooser, but might be qmake-qt5")
 set(RENDERDOC_SWIG_PACKAGE https://github.com/baldurk/swig/archive/renderdoc-modified-6.zip CACHE STRING "The location where RenderDoc's swig fork source can be found. By default points to the URL on github but can be pointed to a local file.")
 
 set(QMAKE_CONFIG "debug")