diff --git a/ares/acinclude.m4 b/ares/acinclude.m4
index 76ff0deef..32a35036c 100644
--- a/ares/acinclude.m4
+++ b/ares/acinclude.m4
@@ -20,27 +20,28 @@ AC_DEFUN([CURL_CC_DEBUG_OPTS],
        AC_MSG_RESULT($gccver)
 
        AC_MSG_CHECKING([if this is icc in disguise])
-       AC_EGREP_CPP([^__ICC], [__ICC],
+       AC_EGREP_CPP([^__INTEL_COMPILER], [__INTEL_COMPILER],
          dnl action if the text is found, this it has not been replaced by the
          dnl cpp
-         [ICC="no"]
+         ICC="no"
          AC_MSG_RESULT([no]),
          dnl the text was not found, it was replaced by the cpp
-         [ICC="yes"]
+         ICC="yes"
          AC_MSG_RESULT([yes])
        )
 
        if test "$ICC" = "yes"; then
          dnl this is icc, not gcc.
 
-         dnl Warning 279 warns on static conditions in while expressions,
-         dnl ignore that.
+         dnl ICC warnings we ignore:
+         dnl * 279 warns on static conditions in while expressions
+         dnl * 269 warns on our "%Od" printf formatters for curl_off_t output:
+         dnl   "invalid format string conversion"
 
-         WARN="-wd279"
+         WARN="-wd279,269"
 
          if test "$gccnum" -gt "600"; then
-            dnl icc 6.0 and older doesn't have the -Wall flag, although it does
-            dnl have -wd<n>
+            dnl icc 6.0 and older doesn't have the -Wall flag
             WARN="-Wall $WARN"
          fi
        else dnl $ICC = yes