diff --git a/ares/m4/cares-functions.m4 b/ares/m4/cares-functions.m4
index 66bf9cae6..1e9bde9a5 100644
--- a/ares/m4/cares-functions.m4
+++ b/ares/m4/cares-functions.m4
@@ -16,7 +16,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 19
+# serial 20
 
 
 dnl CARES_INCLUDES_ARPA_INET
@@ -60,7 +60,7 @@ cares_includes_fcntl="\
 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
 #endif
-#ifdef HAVE_STROPTS_H
+#ifdef HAVE_FCNTL_H
 #  include <fcntl.h>
 #endif
 /* includes end */"
diff --git a/m4/curl-functions.m4 b/m4/curl-functions.m4
index 3b902e6b2..90c7f9194 100644
--- a/m4/curl-functions.m4
+++ b/m4/curl-functions.m4
@@ -22,7 +22,7 @@
 #***************************************************************************
 
 # File version for 'aclocal' use. Keep it a single number.
-# serial 36
+# serial 37
 
 
 dnl CURL_INCLUDES_ARPA_INET
@@ -66,7 +66,7 @@ curl_includes_fcntl="\
 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
 #endif
-#ifdef HAVE_STROPTS_H
+#ifdef HAVE_FCNTL_H
 #  include <fcntl.h>
 #endif
 /* includes end */"