diff --git a/repos/ports/lib/mk/virtualbox5-runtime.mk b/repos/ports/lib/mk/virtualbox5-runtime.mk
index 2f6941c1b8..766c75f11f 100644
--- a/repos/ports/lib/mk/virtualbox5-runtime.mk
+++ b/repos/ports/lib/mk/virtualbox5-runtime.mk
@@ -74,6 +74,7 @@ SRC_CC += Runtime/common/net/netaddrstr2.cpp
 SRC_CC += Runtime/common/path/comparepaths.cpp
 SRC_CC += Runtime/common/path/RTPathAbsDup.cpp
 SRC_CC += Runtime/common/path/RTPathAbsEx.cpp
+SRC_CC += Runtime/common/path/RTPathAppend.cpp
 SRC_CC += Runtime/common/path/RTPathAppendEx.cpp
 SRC_CC += Runtime/common/path/RTPathCalcRelative.cpp
 SRC_CC += Runtime/common/path/RTPathEnsureTrailingSeparator.cpp
diff --git a/repos/ports/src/virtualbox5/unimpl.cc b/repos/ports/src/virtualbox5/unimpl.cc
index b18f394847..0cac95aa84 100644
--- a/repos/ports/src/virtualbox5/unimpl.cc
+++ b/repos/ports/src/virtualbox5/unimpl.cc
@@ -108,7 +108,6 @@ DUMMY(RTProcWait)
 DUMMY(RTLdrGetSuff)
 DUMMY(RTLdrLoadAppPriv)
 
-DUMMY(RTPathAppend)
 DUMMY(RTPathChangeToDosSlashes)
 DUMMY(RTSemEventWaitEx)
 DUMMY(RTSemPing)