diff --git a/matlab/dynare.m b/matlab/dynare.m
index fccfe619c..e04d24d79 100644
--- a/matlab/dynare.m
+++ b/matlab/dynare.m
@@ -87,7 +87,7 @@ if isoctave
         skipline()
     end
 else
-    if matlab_ver_less_than('7.5')
+    if matlab_ver_less_than('7.5') % Should match the test in mex/build/matlab/configure.ac
         skipline()
         warning('This version of Dynare has only been tested on MATLAB 7.5 (R2007b) and above. Since your MATLAB version is older than that, Dynare may fail to run, or give unexpected results. Consider upgrading your MATLAB installation, or switch to Octave.');
         skipline()
diff --git a/mex/build/matlab/configure.ac b/mex/build/matlab/configure.ac
index 668706229..40e93d6f8 100644
--- a/mex/build/matlab/configure.ac
+++ b/mex/build/matlab/configure.ac
@@ -34,6 +34,7 @@ if test "x$ax_enable_matlab" = "xyes"; then
 
   if test "x$ax_matlab_version_ok" = "xyes"; then
     AX_MEXOPTS
+    AX_COMPARE_VERSION([$MATLAB_VERSION], [lt], [7.5], [AC_MSG_ERROR([Your MATLAB is too old, please upgrade to version 7.5 (R2007b) at least.])])
   fi
 
   CFLAGS="$MATLAB_CFLAGS"