diff --git a/kernel/include/std/string.h b/kernel/include/std/string.h
index 8228d872..d8f1a17a 100644
--- a/kernel/include/std/string.h
+++ b/kernel/include/std/string.h
@@ -11,7 +11,7 @@ char* strncpy(char* dest, const char* src, size_t n);
 int strncmp(const char* a, const char* b, size_t n);
 char* strncat(char* dest, const char* src, size_t n);
 
-char* strstr(char* haystack, char* needle);
+char* strstr(char* haystack, const char* needle);
 
 void* memcpy(void* dest, const void* src, size_t n);
 void* memset(void* dest, int c, size_t n);
diff --git a/kernel/src/std/string.cpp b/kernel/src/std/string.cpp
index f3d328a7..b861aa6e 100644
--- a/kernel/src/std/string.cpp
+++ b/kernel/src/std/string.cpp
@@ -66,7 +66,7 @@ char* strcat(char* dest, const char* src)
     return dest;
 }
 
-char* strstr(char* haystack, char* needle)
+char* strstr(char* haystack, const char* needle)
 {
     size_t needle_size = strlen(needle);
     size_t haystack_size = strlen(haystack);