diff --git a/libc/arch-mips/bionic/cacheflush.c b/libc/arch-mips/bionic/cacheflush.cpp
similarity index 98%
rename from libc/arch-mips/bionic/cacheflush.c
rename to libc/arch-mips/bionic/cacheflush.cpp
index 2b03eee83..7955dd69d 100644
--- a/libc/arch-mips/bionic/cacheflush.c
+++ b/libc/arch-mips/bionic/cacheflush.cpp
@@ -55,8 +55,7 @@
 #endif
 
 /* This is the Android signature */
-int cacheflush (long start, long end, long flags)
-{
+int cacheflush (long start, long end, long /*flags*/) {
 	if (end < start) {
 		/*
 		 * It looks like this is really MIPS style cacheflush call
diff --git a/libc/arch-mips/mips.mk b/libc/arch-mips/mips.mk
index 7a3c9789e..3f7094e78 100644
--- a/libc/arch-mips/mips.mk
+++ b/libc/arch-mips/mips.mk
@@ -5,7 +5,7 @@ _LIBC_ARCH_COMMON_SRC_FILES := \
     arch-mips/bionic/_setjmp.S \
     arch-mips/bionic/futex_mips.S \
     arch-mips/bionic/bzero.S \
-    arch-mips/bionic/cacheflush.c \
+    arch-mips/bionic/cacheflush.cpp \
     arch-mips/bionic/clone.S \
     arch-mips/bionic/ffs.S \
     arch-mips/bionic/memcmp16.S \