diff --git a/src/hb-icu.cc b/src/hb-icu.cc
index a00803c..01d15f4 100644
--- a/src/hb-icu.cc
+++ b/src/hb-icu.cc
@@ -332,13 +332,13 @@
   /* Normalise the codepoint using NFKD mode. */
   icu_err = U_ZERO_ERROR;
   len = unorm2_normalize (unorm2_getNFKDInstance (&icu_err), utf16, len, normalized, ARRAY_LENGTH (normalized), &icu_err);
-  if (icu_err)
+  if (U_FAILURE (icu_err))
     return 0;
 
   /* Convert the decomposed form from UTF-16 to UTF-32. */
   icu_err = U_ZERO_ERROR;
   u_strToUTF32 ((UChar32*) decomposed, HB_UNICODE_MAX_DECOMPOSITION_LEN, &utf32_len, normalized, len, &icu_err);
-  if (icu_err)
+  if (U_FAILURE (icu_err))
     return 0;
 
   return utf32_len;