diff --git a/configure.ac b/configure.ac
index 2a3b7fa..1779ec0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -86,7 +86,7 @@ export CFLAGS CC
 AC_SUBST(INSTALL)
 
 AC_MSG_CHECKING([that the compiler works])
-AC_RUN_IFELSE([AC_LANG_SOURCE([[ main(int ac, char **av) { return 0; } ]])],[AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)
+AC_RUN_IFELSE([AC_LANG_SOURCE([[ int main(int ac, char **av) { return 0; } ]])],[AC_MSG_RESULT(yes)],[AC_MSG_RESULT(no)
     AC_MSG_ERROR(Could not compile and run even a trivial ANSI C program - check CC.)],[AC_MSG_ERROR(Could not compile and run even a trivial ANSI C program - check CC.)])
 
 dnl ===========================================================================