diff --git a/src/internal/ntux_nolibc_impl.c b/src/internal/ntux_nolibc_impl.c
index e20d046..c414bc8 100644
--- a/src/internal/ntux_nolibc_impl.c
+++ b/src/internal/ntux_nolibc_impl.c
@@ -63,6 +63,11 @@ char * ntux_strrchr(const char * ch, int c)
 	return 0;
 }
 
+int ntux_isblank(int c)
+{
+	return ((c == 0x20) || (c == 0x09));
+}
+
 #ifdef NTUX_EXPORT
 int __stdcall ntux_entry_point(void * hinstance, uint32_t reason, void * reserved)
 {
diff --git a/src/internal/ntux_nolibc_impl.h b/src/internal/ntux_nolibc_impl.h
index eac2631..f68d282 100644
--- a/src/internal/ntux_nolibc_impl.h
+++ b/src/internal/ntux_nolibc_impl.h
@@ -16,6 +16,8 @@
 #define strchr   ntux_strchr
 #define strrchr  ntux_strrchr
 
+#define isblank  ntux_isblank
+
 #define calloc	 ntux_calloc
 #define free	 ntux_free