diff --git a/include/asm-mips/mipsprom.h b/include/asm-mips/mipsprom.h
index ce7cff7..146d41b 100644
--- a/include/asm-mips/mipsprom.h
+++ b/include/asm-mips/mipsprom.h
@@ -71,4 +71,6 @@
 #define PROM_NV_GET		53	/* XXX */
 #define PROM_NV_SET		54	/* XXX */
 
+extern char *prom_getenv(char *);
+
 #endif /* __ASM_MIPS_PROM_H */