diff --git a/configure b/configure
index 2ab935b1a57..fa0d59a46a1 100755
--- a/configure
+++ b/configure
@@ -5121,8 +5121,8 @@ $as_echo_n "checking for recent enough icotool... " >&6; }
     icotool_version=`icotool --version | head -n1`
     if test "x$icotool_version" != "x"
     then
-      icotool_version_major=`expr "$icotool_version" : '.* \([0-9]*\).[0-9]*'`
-      icotool_version_minor=`expr "$icotool_version" : '.* [0-9]*.\([0-9]*\)'`
+      icotool_version_major=`expr "$icotool_version" : '.* \([0-9]*\)\.[0-9]*'`
+      icotool_version_minor=`expr "$icotool_version" : '.* [0-9]*\.\([0-9]*\)'`
       if test "$icotool_version_major" -eq 0 -a "$icotool_version_minor" -lt 29
       then
         ICOTOOL=false
diff --git a/configure.ac b/configure.ac
index df70de62975..006a325039d 100644
--- a/configure.ac
+++ b/configure.ac
@@ -296,8 +296,8 @@ then
     icotool_version=`icotool --version | head -n1`
     if test "x$icotool_version" != "x"
     then
-      icotool_version_major=`expr "$icotool_version" : '.* \([[0-9]]*\).[[0-9]]*'`
-      icotool_version_minor=`expr "$icotool_version" : '.* [[0-9]]*.\([[0-9]]*\)'`
+      icotool_version_major=`expr "$icotool_version" : '.* \([[0-9]]*\)\.[[0-9]]*'`
+      icotool_version_minor=`expr "$icotool_version" : '.* [[0-9]]*\.\([[0-9]]*\)'`
       if test "$icotool_version_major" -eq 0 -a "$icotool_version_minor" -lt 29
       then
         ICOTOOL=false