diff --git a/src/tokenize.cpp b/src/tokenize.cpp
index 3be0a7dba..9aef5756e 100644
--- a/src/tokenize.cpp
+++ b/src/tokenize.cpp
@@ -1504,6 +1504,13 @@ void Tokenizer::simplifyTokenList()
         }
     }
 
+    // Replace "and" with "&&"
+    for (Token *tok = _tokens; tok; tok = tok->next())
+    {
+        if (tok->str() == "and")
+            tok->str("&&");
+    }
+
     simplifyCasts();
 
     // Simplify simple calculations..
diff --git a/test/testsimplifytokens.cpp b/test/testsimplifytokens.cpp
index feaed86a5..cdeb768e2 100644
--- a/test/testsimplifytokens.cpp
+++ b/test/testsimplifytokens.cpp
@@ -91,6 +91,10 @@ private:
 
         // Simplify "not" to "!" (#345)
         TEST_CASE(not1);
+
+        // Simplify "and" to "&&" (#620)
+        TEST_CASE(and1);
+
         TEST_CASE(comma_keyword);
         TEST_CASE(remove_comma);
 
@@ -1030,6 +1034,15 @@ private:
         ASSERT_EQUALS("void foo ( not i )", simplifyNot("void foo ( not i )"));
     }
 
+    void and1()
+    {
+        ASSERT_EQUALS(" if ( p && q )",
+              sizeof_(" if (p and q)"));
+
+        ASSERT_EQUALS(" return operator == ( a ) && radius == 4 ;",
+              sizeof_(" return operator==(a) and radius == 4;"));
+    }
+
     void comma_keyword()
     {
         {