diff --git a/container.go b/container.go
index 2a99c72..f542cf8 100644
--- a/container.go
+++ b/container.go
@@ -295,7 +295,7 @@
 		return nil, ErrNoSnapshot
 	}
 
-	gosnapshots := (*[1 << 30]C.struct_lxc_snapshot)(unsafe.Pointer(csnapshots))[:size:size]
+	gosnapshots := (*[(1 << 30) - 1]C.struct_lxc_snapshot)(unsafe.Pointer(csnapshots))[:size:size]
 	snapshots := make([]Snapshot, size, size)
 	for i := 0; i < size; i++ {
 		snapshots[i] = Snapshot{
diff --git a/util.go b/util.go
index 40ba65c..65fdd83 100644
--- a/util.go
+++ b/util.go
@@ -81,7 +81,7 @@
 		return nil
 	}
 
-	tmpslice := (*[1 << 30]*C.char)(unsafe.Pointer(cArgs))[:size:size]
+	tmpslice := (*[(1 << 29) - 1]*C.char)(unsafe.Pointer(cArgs))[:size:size]
 	result := make([]string, size)
 	for i, s := range tmpslice {
 		result[i] = C.GoString(s)