diff --git a/Libraries/LibC/ctype.h b/Libraries/LibC/ctype.h
index 740832f162..de88a12354 100644
--- a/Libraries/LibC/ctype.h
+++ b/Libraries/LibC/ctype.h
@@ -45,18 +45,6 @@ extern const char _ctype_[256];
 
 int tolower(int);
 int toupper(int);
-int isalnum(int);
-int isalpha(int);
-int iscntrl(int);
-int isdigit(int);
-int isxdigit(int);
-int isspace(int);
-int ispunct(int);
-int isprint(int);
-int isgraph(int);
-int islower(int);
-int isupper(int);
-int isblank(int);
 
 #define isalnum(c) (_ctype_[(int)(c)] & (_U | _L | _N))
 #define isalpha(c) (_ctype_[(int)(c)] & (_U | _L))