diff --git a/src/libs/libs.pro b/src/libs/libs.pro
index e441020b7feaeab88747f34837f77b1fcc6f6a42..719cbe10fef6e2769c8bd57db3b447636cfb028d 100644
--- a/src/libs/libs.pro
+++ b/src/libs/libs.pro
@@ -19,5 +19,5 @@ SUBDIRS   = \
 # Windows: Compile Qt Creator CDB extension if Debugging tools can be detected.    
 win32 {
     include(qtcreatorcdbext/cdb_detect.pri)
-    !isEmpty(CDB_PATH):SUBDIRS += qtcreatorcdbext
+    exists($$CDB_PATH):SUBDIRS += qtcreatorcdbext
 }
diff --git a/src/libs/qtcreatorcdbext/cdb_detect.pri b/src/libs/qtcreatorcdbext/cdb_detect.pri
index ac25ae2a472e2ae0541010917a897f94586a04e4..6fbdee5a6c0a191ffad73c6a583caa1968c4abaf 100644
--- a/src/libs/qtcreatorcdbext/cdb_detect.pri
+++ b/src/libs/qtcreatorcdbext/cdb_detect.pri
@@ -12,5 +12,6 @@ win32 {
         !exists($$CDB_PATH):CDB_PATH="$$(ProgramW6432)/Debugging Tools For Windows (x86)/sdk"
         !exists($$CDB_PATH):CDB_PATH="$$(ProgramW6432)/Debugging Tools For Windows (x64)/sdk"
         !exists($$CDB_PATH):CDB_PATH="$$(ProgramW6432)/Debugging Tools For Windows 64-bit/sdk"
+        !exists($$CDB_PATH)::CDB_PATH=""
     }
 }