diff --git a/libkern/string.c b/libkern/string.c
index 68cc92b5c..549d101c1 100644
--- a/libkern/string.c
+++ b/libkern/string.c
@@ -10,7 +10,7 @@
 
 #include <hermit/string.h>
 
-#ifndef HAVE_ARCH_MEMCPY
+#if !HAVE_ARCH_MEMCPY
 void *memcpy(void *dest, const void *src, size_t count)
 {
 	size_t i;
@@ -25,7 +25,7 @@ void *memcpy(void *dest, const void *src, size_t count)
 }
 #endif
 
-#ifndef HAVE_ARCH_MEMSET
+#if !HAVE_ARCH_MEMSET
 void *memset(void *dest, int val, size_t count)
 {
 	size_t i;
@@ -40,7 +40,7 @@ void *memset(void *dest, int val, size_t count)
 }
 #endif
 
-#ifndef HAVE_ARCH_MEMCMP
+#if !HAVE_ARCH_MEMCMP
 int memcmp(const void *s1, const void *s2, size_t n)
 {
 	if (n != 0) {
@@ -56,7 +56,7 @@ int memcmp(const void *s1, const void *s2, size_t n)
 }
 #endif
 
-#ifndef HAVE_ARCH_STRLEN
+#if !HAVE_ARCH_STRLEN
 size_t strlen(const char *str)
 {
 	size_t len = 0;
@@ -71,7 +71,7 @@ size_t strlen(const char *str)
 }
 #endif
 
-#ifndef HAVE_ARCH_STRNCPY
+#if !HAVE_ARCH_STRNCPY
 char* strncpy(char *dest, const char *src, size_t n)
 {
 	size_t i;
@@ -90,7 +90,7 @@ char* strncpy(char *dest, const char *src, size_t n)
 }
 #endif
 
-#ifndef HAVE_ARCH_STRCPY
+#if !HAVE_ARCH_STRCPY
 char* strcpy(char *dest, const char *src)
 {
         size_t i;
@@ -106,7 +106,7 @@ char* strcpy(char *dest, const char *src)
 }
 #endif
 
-#ifndef HAVE_ARCH_STRCMP
+#if !HAVE_ARCH_STRCMP
 int strcmp(const char *s1, const char *s2)
 {
 	while (*s1 != '\0' && *s1 == *s2) {
@@ -118,7 +118,7 @@ int strcmp(const char *s1, const char *s2)
 }
 #endif
 
-#ifndef HAVE_ARCH_STRNCMP
+#if !HAVE_ARCH_STRNCMP
 int strncmp(const char *s1, const char *s2, size_t n)
 {
 	if (BUILTIN_EXPECT(n == 0, 0))