diff --git a/acinclude.m4 b/acinclude.m4
index 46b087c2..9f772923 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -1894,10 +1894,10 @@ AC_DEFUN([CURL_CC_DEBUG_OPTS],
          WARN="-wd279,269,981,1418,1419"
          WARN=""
 
-         if test "$gccnum" -gt "600"; then
-            dnl icc 6.0 and older doesn't have the -Wall flag
-            WARN="-Wall $WARN"
-         fi
+         dnl if test "$gccnum" -gt "600"; then
+         dnl    dnl icc 6.0 and older doesn't have the -Wall flag
+         dnl    WARN="-Wall $WARN"
+         dnl fi
        else dnl $ICC = yes
          dnl this is a set of options we believe *ALL* gcc versions support:
          WARN="-W -Wall -Wwrite-strings -pedantic -Wpointer-arith -Wnested-externs -Winline -Wmissing-prototypes"
diff --git a/configure.ac b/configure.ac
index f0e1a04f..666facd4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -229,6 +229,12 @@ if test "$curl_cv_have_def___INTEL_COMPILER" = "yes"; then
   dnl On Linux this compiler uses gcc's header files, so
   dnl we select ANSI C89 dialect plus GNU extensions.
   CPPFLAGS="$CPPFLAGS -std=gnu89"
+  if test "$curl_cv_def___INTEL_COMPILER" -gt "600"; then
+    dnl Show errors, warnings, and remarks
+    CPPFLAGS="$CPPFLAGS -Wall"
+    dnl Perform extra compile-time code checking
+    CPPFLAGS="$CPPFLAGS -Wcheck"
+  fi
   dnl Change some warnings into errors
   dnl #140: too many arguments in function call
   dnl #147: declaration is incompatible with 'previous one'