diff --git a/tools/llvm-config/llvm-config.cpp b/tools/llvm-config/llvm-config.cpp
index 452f78f6af1..2ee1da63128 100644
--- a/tools/llvm-config/llvm-config.cpp
+++ b/tools/llvm-config/llvm-config.cpp
@@ -240,6 +240,7 @@ int main(int argc, char **argv) {
     // layout.
     switch (DevelopmentTreeLayout) {
     case MakefileStyle:
+      ActivePrefix = ActiveObjRoot;
       ActiveBinDir = ActiveObjRoot + "/" + build_mode + "/bin";
       ActiveLibDir = ActiveObjRoot + "/" + build_mode + "/lib";
       break;