diff --git a/Makefile b/Makefile
index e9b8e68..14e3240 100644
--- a/Makefile
+++ b/Makefile
@@ -41,7 +41,8 @@ lib:
 
 clean:
 	rm -f src/*.o tests/*.o
-	rm -f bin/* tmp
+	rm -f bin/* 
+	rm -rf tmp
 
 DEBUG = #-DDEBUG_DUMP
 
diff --git a/src/stackman.h b/src/stackman.h
index defd15f..4a2bf78 100644
--- a/src/stackman.h
+++ b/src/stackman.h
@@ -72,7 +72,7 @@
 #define STACKMAN_SP_ALIGN_UP(a)	  (((intptr_t)((a)+STACKMAN_STACK_ALIGN-1) & ~(STACKMAN_STACK_ALIGN-1)))
 
 #if STACKMAN_STACK_DIR == 0
-#define STACKMAN_SP_FURTHEST      ((void*) ^(intptr_t)-1)
+#define STACKMAN_SP_FURTHEST      ((void*) (intptr_t) -STACKMAN_STACK_ALIGN)
 #define STACKMAN_SP_NEAREST       ((void*) 0)
 #define STACKMAN_SP_LS(a, b)      ((void*)(a) < (void*)(b))     /* to compare stack position */
 #define STACKMAN_SP_LE(a, b)      ((void*)(a) <= (void*)(b))    /* to compare stack position */
@@ -82,7 +82,7 @@
 #else
 /* upwards growing stacks */
 #define STACKMAN_SP_FURTHEST      ((void*) 0)
-#define STACKMAN_SP_NEAREST       ((void*) ^(intptr_t)-1)
+#define STACKMAN_SP_NEAREST       ((void*) (intptr_t) -STACKMAN_STACK_ALIGN)
 #define STACKMAN_SP_LS(a, b)      ((void*)(a) > (void*)(b))     /* to compare stack position */
 #define STACKMAN_SP_LE(a, b)      ((void*)(a) >= (void*)(b))    /* to compare stack position */
 #define STACKMAN_SP_ADD(a, b)     ((a) - (b))                   /* to add offset to stack pointer */
diff --git a/tests/test.c b/tests/test.c
index a3efd23..6ed3cb0 100644
--- a/tests/test.c
+++ b/tests/test.c
@@ -254,6 +254,24 @@ void test_04(void)
 
 #endif
 
+/* Test our various macros */
+void test_05()
+{
+
+	int local=0;
+	void *away = STACKMAN_SP_FURTHEST;
+	void *close = STACKMAN_SP_NEAREST;
+	assert(STACKMAN_SP_LE(&local, away));
+	assert(STACKMAN_SP_LS(&local, away));
+	assert(STACKMAN_SP_LE(close, &local));
+	assert(STACKMAN_SP_LS(close, &local));
+
+	assert(STACKMAN_SP_LE(&local, &local));
+	assert(!STACKMAN_SP_LS(&local, &local));
+
+	assert((void*)STACKMAN_SP_ALIGN(away) == away);
+
+}
 
 int main(int argc, char*argv[])
 {
@@ -269,5 +287,7 @@ int main(int argc, char*argv[])
 	test_04();
 	printf("test_04 ok\n");
 #endif
+	test_05();
+	printf("test_05 ok\n");
 	return 0;
 }