diff --git a/utils/idna.c b/utils/idna.c
index d8d4ae497..2d1bb4ccb 100644
--- a/utils/idna.c
+++ b/utils/idna.c
@@ -168,7 +168,7 @@ static bool idna__contextj_rule(int32_t *label, int index, size_t len)
 			return false; /* No previous character */
 		}
 		unicode_props = utf8proc_get_property(label[index - 1]);
-		if (unicode_props->combining_class == UTF8PROC_CCC_VIRAMA) {
+		if (unicode_props->combining_class == IDNA_UNICODE_CCC_VIRAMA) {
 			return true;
 		}
 
@@ -207,7 +207,7 @@ static bool idna__contextj_rule(int32_t *label, int index, size_t len)
 			return false; /* No previous character */
 		}
 		unicode_props = utf8proc_get_property(label[index - 1]);
-		if (unicode_props->combining_class == UTF8PROC_CCC_VIRAMA) {
+		if (unicode_props->combining_class == IDNA_UNICODE_CCC_VIRAMA) {
 			return true;
 		}
 		return false;
diff --git a/utils/idna.h b/utils/idna.h
index c59a22763..1fb344730 100644
--- a/utils/idna.h
+++ b/utils/idna.h
@@ -23,6 +23,11 @@
 #ifndef _NETSURF_UTILS_IDNA_H_
 #define _NETSURF_UTILS_IDNA_H_
 
+/**
+ * Unicode canonical combining class for virama
+ */
+#define IDNA_UNICODE_CCC_VIRAMA 9
+
 /**
  * Convert a hostname to an ACE version suitable for DNS lookup
  *