diff --git a/reactos/ntoskrnl/ntoskrnl-generic.rbuild b/reactos/ntoskrnl/ntoskrnl-generic.rbuild
index 7893c1f7d28..d428ca4dd21 100644
--- a/reactos/ntoskrnl/ntoskrnl-generic.rbuild
+++ b/reactos/ntoskrnl/ntoskrnl-generic.rbuild
@@ -166,7 +166,7 @@
interlck_asm.S
fastinterlck_asm.S
- ioport.s
+ ioport.S
atom.c
@@ -176,7 +176,7 @@
event.c
evtpair.c
exintrin.c
- fastinterlck.c
+ fastinterlck.c
fmutex.c
handle.c
harderr.c