diff --git a/c/src/lib/libbsp/powerpc/ss555/startup/tm27supp.c b/c/src/lib/libbsp/powerpc/ss555/startup/tm27supp.c
index c2cf9f85c6..fb48396e04 100644
--- a/c/src/lib/libbsp/powerpc/ss555/startup/tm27supp.c
+++ b/c/src/lib/libbsp/powerpc/ss555/startup/tm27supp.c
@@ -6,15 +6,15 @@
 
 #include <bsp.h>
 
-void tm27On()
+void tm27On(void)
 {
 }
 
-void tm27Off()
+void tm27Off(void)
 {
 }
 
-int tm27IsOn()
+int tm27IsOn(void)
 {
   return 1;
 }