diff --git a/cppflags-iterator.mk b/cppflags-iterator.mk
index d4e6375416..89a472bd82 100644
--- a/cppflags-iterator.mk
+++ b/cppflags-iterator.mk
@@ -4,4 +4,4 @@
 cpp-src := $(firstword $(cpp-srcs-left))
 cpp-srcs-left := $(filter-out $(cpp-src),$(cpp-srcs-left))
 
-libof-$(cpp-src) := $(lib)
+libof-$(notdir $(cpp-src)) := $(lib)