diff --git a/src/lexer.c b/src/lexer.c
index 1e3c4074f99f..20cd477b25d0 100644
--- a/src/lexer.c
+++ b/src/lexer.c
@@ -2406,7 +2406,7 @@ __body
     if (*p == 'i' || *p == 'I')
     {
         if (*p == 'I')
-            deprecation("'I' suffix is deprecated, use 'i' instead");
+            error("'I' suffix is deprecated, use 'i' instead");
         p++;
         switch (result)
         {