diff --git a/tools/split-select/SplitSelector.h b/tools/split-select/SplitSelector.h
index 193fda7077d3c..120354f608f33 100644
--- a/tools/split-select/SplitSelector.h
+++ b/tools/split-select/SplitSelector.h
@@ -29,7 +29,7 @@ namespace split {
 class SplitSelector {
 public:
     SplitSelector();
-    SplitSelector(const android::Vector<SplitDescription>& splits);
+    explicit SplitSelector(const android::Vector<SplitDescription>& splits);
 
     android::Vector<SplitDescription> getBestSplits(const SplitDescription& target) const;