diff --git a/mkspecs/android-g++/qmake.conf b/mkspecs/android-g++/qmake.conf
index d1b94bb1aa3..5a056b3d006 100644
--- a/mkspecs/android-g++/qmake.conf
+++ b/mkspecs/android-g++/qmake.conf
@@ -27,6 +27,10 @@ contains(QMAKE_HOST.os,Windows) {
     } else {
         MINGW_IN_SHELL = 1
         QMAKE_DIR_SEP = /
+        # Because install's ability to set permissions is not relevant on Windows,
+        # and git's msys does not provide it to start with.
+        QMAKE_INSTALL_FILE = cp -f
+        QMAKE_INSTALL_PROGRAM = cp -f
     }
 }
 
diff --git a/mkspecs/win32-g++/qmake.conf b/mkspecs/win32-g++/qmake.conf
index 22277e1e82a..9c776e86558 100644
--- a/mkspecs/win32-g++/qmake.conf
+++ b/mkspecs/win32-g++/qmake.conf
@@ -94,6 +94,10 @@ QMAKE_LIBS_QT_ENTRY     = -lmingw32 -lqtmain
     MINGW_IN_SHELL      = 1
     QMAKE_DIR_SEP       = /
     include(../common/shell-unix.conf)
+    # Because install's ability to set permissions is not relevant on Windows,
+    # and git's msys does not provide it to start with.
+    QMAKE_INSTALL_FILE    = cp -f
+    QMAKE_INSTALL_PROGRAM = cp -f
 } else {
     include(../common/shell-win32.conf)
 }