diff --git a/arch/mips/lib/bswapdi.c b/arch/mips/lib/bswapdi.c
index fcef74084492..1d020e1c96a0 100644
--- a/arch/mips/lib/bswapdi.c
+++ b/arch/mips/lib/bswapdi.c
@@ -2,6 +2,9 @@
 #include <linux/export.h>
 #include <linux/compiler.h>
 
+/* To silence -Wmissing-prototypes. */
+unsigned long long __bswapdi2(unsigned long long u);
+
 unsigned long long notrace __bswapdi2(unsigned long long u)
 {
 	return (((u) & 0xff00000000000000ull) >> 56) |
@@ -13,5 +16,4 @@ unsigned long long notrace __bswapdi2(unsigned long long u)
 	       (((u) & 0x000000000000ff00ull) << 40) |
 	       (((u) & 0x00000000000000ffull) << 56);
 }
-
 EXPORT_SYMBOL(__bswapdi2);
diff --git a/arch/mips/lib/bswapsi.c b/arch/mips/lib/bswapsi.c
index 22d8e4f6d66e..02d9df489197 100644
--- a/arch/mips/lib/bswapsi.c
+++ b/arch/mips/lib/bswapsi.c
@@ -2,6 +2,9 @@
 #include <linux/export.h>
 #include <linux/compiler.h>
 
+/* To silence -Wmissing-prototypes. */
+unsigned int __bswapsi2(unsigned int u);
+
 unsigned int notrace __bswapsi2(unsigned int u)
 {
 	return (((u) & 0xff000000) >> 24) |
@@ -9,5 +12,4 @@ unsigned int notrace __bswapsi2(unsigned int u)
 	       (((u) & 0x0000ff00) <<  8) |
 	       (((u) & 0x000000ff) << 24);
 }
-
 EXPORT_SYMBOL(__bswapsi2);