diff --git a/opus.m4 b/opus.m4
index 20f166b..47f5ec4 100644
--- a/opus.m4
+++ b/opus.m4
@@ -102,7 +102,7 @@
        echo "*** If you have an old version installed, it is best to remove it, although"
        echo "*** you may also be able to get things to work by modifying LD_LIBRARY_PATH"],
        [ echo "*** The test program failed to compile or link. See the file config.log for the"
-       echo "*** exact error that occured. This usually means Opus was incorrectly installed"
+       echo "*** exact error that occurred. This usually means Opus was incorrectly installed"
        echo "*** or that you have moved Opus since it was installed." ])
        CFLAGS="$ac_save_CFLAGS"
        LIBS="$ac_save_LIBS"