diff --git a/configure.ac b/configure.ac
index c95a496..5c31c07 100644
--- a/configure.ac
+++ b/configure.ac
@@ -71,7 +71,7 @@ fi
 _LIBS="${LIBS}"
 _CFLAGS="${CFLAGS}"
 _CPPFLAGS="${CPPFLAGS}"
-LIBS="${LIBS} ${LUA_LIBS}"
+LIBS="-lm ${LIBS} ${LUA_LIBS}"
 CFLAGS="${CFLAGS} ${LUA_CFLAGS}"
 CPPFLAGS="${CPPFLAGS} ${LUA_CFLAGS}"