diff --git a/include/linux/string.h b/include/linux/string.h
index 9e47fe01c16..a28150fa578 100644
--- a/include/linux/string.h
+++ b/include/linux/string.h
@@ -101,10 +101,9 @@ size_t strcspn(const char *s, const char *reject);
 # define strndup		sandbox_strndup
 #endif
 
-#ifndef __HAVE_ARCH_STRDUP
 extern char * strdup(const char *);
 extern char * strndup(const char *, size_t);
-#endif
+
 #ifndef __HAVE_ARCH_STRSWAB
 extern char * strswab(const char *);
 #endif
diff --git a/lib/string.c b/lib/string.c
index c2813e0f854..2c1baa568b9 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -343,7 +343,6 @@ size_t strcspn(const char *s, const char *reject)
 }
 #endif
 
-#ifndef __HAVE_ARCH_STRDUP
 char * strdup(const char *s)
 {
 	char *new;
@@ -379,7 +378,6 @@ char * strndup(const char *s, size_t n)
 
 	return new;
 }
-#endif
 
 #ifndef __HAVE_ARCH_STRSPN
 /**