diff --git a/sys/conf/files.mips b/sys/conf/files.mips
index b19944e5e6a..1a7f7d54a35 100644
--- a/sys/conf/files.mips
+++ b/sys/conf/files.mips
@@ -50,6 +50,7 @@ mips/mips/vm_machdep.c			standard
 # misc opt-in bits
 kern/kern_clocksource.c			standard
 kern/link_elf_obj.c			standard
+kern/subr_atomic64.c			optional	mips | mipsel | mipshf | mipselhf
 kern/subr_busdma_bufalloc.c		standard
 kern/subr_dummy_vdso_tc.c		standard
 kern/subr_sfbuf.c			optional	mips | mipsel | mipsn32
diff --git a/sys/mips/include/atomic.h b/sys/mips/include/atomic.h
index 2745b9662ea..ad8abf3498f 100644
--- a/sys/mips/include/atomic.h
+++ b/sys/mips/include/atomic.h
@@ -38,6 +38,10 @@
 
 #include <sys/atomic_common.h>
 
+#if !defined(__mips_n64) && !defined(__mips_n32)
+#include <sys/_atomic64e.h>
+#endif
+
 /*
  * Note: All the 64-bit atomic operations are only atomic when running
  * in 64-bit mode.  It is assumed that code compiled for n32 and n64