diff --git a/gnu/usr.bin/gdb/arch/arm/Makefile b/gnu/usr.bin/gdb/arch/arm/Makefile
index e937afa790b..22aee06a7bf 100644
--- a/gnu/usr.bin/gdb/arch/arm/Makefile
+++ b/gnu/usr.bin/gdb/arch/arm/Makefile
@@ -4,7 +4,7 @@ GENSRCS+= xm.h
 LIBSRCS+= armfbsd-nat.c
 LIBSRCS+= arm-tdep.c armfbsd-tdep.c solib.c solib-svr4.c
 .if !defined(GDB_CROSS_DEBUGGER)
-LIBSRC+= fbsd-threads.c
+LIBSRCS+= fbsd-threads.c
 .endif
 
 nm.h: