diff --git a/include/etl/pearson.h b/include/etl/pearson.h
index fffae1d8..2b1d0ab2 100644
--- a/include/etl/pearson.h
+++ b/include/etl/pearson.h
@@ -93,6 +93,7 @@ namespace etl
     void reset()
     {
       hash.fill(0);
+      first = true;
     }
 
     //*************************************************************************
diff --git a/test/test_pearson.cpp b/test/test_pearson.cpp
index 4b5e5609..aa3eea30 100644
--- a/test/test_pearson.cpp
+++ b/test/test_pearson.cpp
@@ -144,6 +144,25 @@ namespace
       CHECK(compare == hash);
     }
 
+    //*************************************************************************
+    TEST(test_pearson_reset)
+    {
+      std::string data("123456789");
+
+      etl::pearson<HASH_SIZE> pearson_calculator;
+
+      // Use the calculator, then reset it and reuse it for the same data.
+      pearson_calculator.add(data.begin(), data.end());
+      pearson_calculator.reset();
+      pearson_calculator.add(data.begin(), data.end());
+
+      hash_t compare = Pearson_Compare(data);
+      hash_t hash    = pearson_calculator.value();
+
+      // A reset calculator must produce the same hash as a fresh one.
+      CHECK(compare == hash);
+    }
+
     //*************************************************************************
     TEST(test_pearson_add_range_endian)
     {