diff --git a/installerfw.pri b/installerfw.pri
index bd84092a..c71749db 100644
--- a/installerfw.pri
+++ b/installerfw.pri
@@ -11,6 +11,9 @@ IFW_NEWLINE = $$escape_expand(\\n\\t)
 defineReplace(toNativeSeparators) {
     return($$replace(1, /, $$QMAKE_DIR_SEP))
 }
+defineReplace(fromNativeSeparators) {
+    return($$replace(1, \\\\, /))
+}
 
 defineReplace(cleanPath) {
     win32:1 ~= s|\\\\|/|g
diff --git a/tests/auto/installer/consumeoutputoperationtest/consumeoutputoperationtest.pro b/tests/auto/installer/consumeoutputoperationtest/consumeoutputoperationtest.pro
index 0cc9e705..a6fbc60f 100644
--- a/tests/auto/installer/consumeoutputoperationtest/consumeoutputoperationtest.pro
+++ b/tests/auto/installer/consumeoutputoperationtest/consumeoutputoperationtest.pro
@@ -5,4 +5,4 @@ QT += testlib
 
 SOURCES = tst_consumeoutputoperationtest.cpp
 
-DEFINES += "QMAKE_BINARY=$$QMAKE_BINARY"
+DEFINES += "QMAKE_BINARY=$$fromNativeSeparators($$QMAKE_BINARY)"