1 files changed, 1 insertions, 1 deletions

diff --git a/tools/functions.make b/tools/functions.make
index 4061cf658f..97c98a1f8d 100644
--- a/tools/functions.make
+++ b/tools/functions.make
@@ -25,7 +25,7 @@ preprocess = $(shell $(CC) $(PPCFLAGS) $(2) -E -P -x c -include config.h $(1) |
 preprocess2file = $(shell $(CC) $(PPCFLAGS) $(3) -E -P -x c -include config.h $(1) | \
                 grep -v '^\#' | grep -v "^$$" > $(2))
 
-c2obj = $(subst .c,.o,$(subst .S,.o,$(subst $(ROOTDIR),$(BUILDDIR),$(1))))
+c2obj = $(addsuffix .o,$(basename $(subst $(ROOTDIR),$(BUILDDIR),$(1))))
 
 # calculate dependencies for a list of source files $(2) and output them
 # to a file $(1)