diff --git a/lib/percpu_counter.c b/lib/percpu_counter.c
index 7a87003..8504490 100644
--- a/lib/percpu_counter.c
+++ b/lib/percpu_counter.c
@@ -5,10 +5,10 @@
 #include <linux/percpu_counter.h>
 #include <linux/module.h>
 
-void percpu_counter_mod(struct percpu_counter *fbc, long amount)
+void percpu_counter_mod(struct percpu_counter *fbc, s32 amount)
 {
 	long count;
-	long *pcount;
+	s32 *pcount;
 	int cpu = get_cpu();
 
 	pcount = per_cpu_ptr(fbc->counters, cpu);
@@ -29,15 +29,15 @@
  * Add up all the per-cpu counts, return the result.  This is a more accurate
  * but much slower version of percpu_counter_read_positive()
  */
-long percpu_counter_sum(struct percpu_counter *fbc)
+s64 percpu_counter_sum(struct percpu_counter *fbc)
 {
-	long ret;
+	s64 ret;
 	int cpu;
 
 	spin_lock(&fbc->lock);
 	ret = fbc->count;
 	for_each_possible_cpu(cpu) {
-		long *pcount = per_cpu_ptr(fbc->counters, cpu);
+		s32 *pcount = per_cpu_ptr(fbc->counters, cpu);
 		ret += *pcount;
 	}
 	spin_unlock(&fbc->lock);