diff --git a/src/polyp/utf8.h b/src/polyp/utf8.h
index e9a515330..3cc3a7d08 100644
--- a/src/polyp/utf8.h
+++ b/src/polyp/utf8.h
@@ -22,14 +22,20 @@
   USA.
 ***/
 
+#include <polyp/cdecl.h>
+
 /** \file
  * UTF8 Validation functions
  */
 
+PA_C_DECL_BEGIN
+
 /** Test if the specified strings qualifies as valid UTF8. Return the string if so, otherwise NULL */
 const char *pa_utf8_valid(const char *str);
 
 /** Filter all invalid UTF8 characters from the specified string, returning a new fully UTF8 valid string. Don't forget to free the returned string with pa_xfree() */
 char *pa_utf8_filter(const char *str);
 
+PA_C_DECL_END
+
 #endif