--- sdlmm.m4
+++ sdlmm.m4
@@ -9,7 +9,7 @@
 dnl AM_PATH_SDLMM([MINIMUM-VERSION, [ACTION-IF-FOUND [, ACTION-IF-NOT-FOUND]]])
 dnl Test for SDLmm, and define SDLMM_CXXFLAGS and SDLMM_LIBS
 dnl
-AC_DEFUN(AM_PATH_SDLMM,
+AC_DEFUN([AM_PATH_SDLMM],
 [dnl 
 dnl Get the cflags and libraries from the ismap-config script
 dnl