diff --git a/configure.ac b/configure.ac
index 8a5390d1463e9aabf186e1d9d73e9b0b3eda8afb..9c99de437d69d55cbb27507c44c25681994ddbf4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -395,7 +395,7 @@ int main(void)
 
 dnl Checks for functions.
 
-AC_CHECK_FUNCS(getdelim getline isblank snprintf strcasecmp strncasecmp strcasestr strnlen vsnprintf)
+AC_CHECK_FUNCS(getdelim getline isblank snprintf strcasecmp strcasestr strncasecmp strnlen vsnprintf)
 
 if test x$enable_utf8 != xno; then
     AC_CHECK_FUNCS(iswalnum iswblank iswpunct iswspace mblen mbstowcs mbtowc wctomb wcwidth)