diff --git a/library/wctype_iswcntrl.c b/library/wctype_iswcntrl.c
index 802422e..029e1d2 100644
--- a/library/wctype_iswcntrl.c
+++ b/library/wctype_iswcntrl.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswcntrl(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return iscntrl(c);
 }
diff --git a/library/wctype_iswgraph.c b/library/wctype_iswgraph.c
index 3c63dba..5c18f87 100644
--- a/library/wctype_iswgraph.c
+++ b/library/wctype_iswgraph.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswgraph(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return isgraph(c);
 }
diff --git a/library/wctype_iswlower.c b/library/wctype_iswlower.c
index cac10a8..fe32f8d 100644
--- a/library/wctype_iswlower.c
+++ b/library/wctype_iswlower.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswlower(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return islower(c);
 }
diff --git a/library/wctype_iswpunc.c b/library/wctype_iswpunc.c
index 40d98ea..62f4f09 100644
--- a/library/wctype_iswpunc.c
+++ b/library/wctype_iswpunc.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
-iswpunc(wint_t c)
+iswpunct(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return ispunct(c);
 }
diff --git a/library/wctype_iswspace.c b/library/wctype_iswspace.c
index 8c5afa4..ced9faf 100644
--- a/library/wctype_iswspace.c
+++ b/library/wctype_iswspace.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswspace(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return isspace(c);
 }
diff --git a/library/wctype_iswupper.c b/library/wctype_iswupper.c
index 5abc11e..e3f7bf9 100644
--- a/library/wctype_iswupper.c
+++ b/library/wctype_iswupper.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswupper(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return isupper(c);
 }
diff --git a/library/wctype_iswxdigit.c b/library/wctype_iswxdigit.c
index 3489cac..06e4b50 100644
--- a/library/wctype_iswxdigit.c
+++ b/library/wctype_iswxdigit.c
@@ -35,11 +35,12 @@
 #include <wctype.h>
 #endif /* _WCTYPE_HEADERS_H */
 
+#include <ctype.h>
+
 /****************************************************************************/
 
 int
 iswxdigit(wint_t c)
 {
-	/* ZZZ unimplemented */
-	return(0);
+	return isxdigit(c);
 }