diff --git a/lib/checkleakautovar.cpp b/lib/checkleakautovar.cpp
index b620374a2..acb29749b 100644
--- a/lib/checkleakautovar.cpp
+++ b/lib/checkleakautovar.cpp
@@ -302,8 +302,11 @@ void CheckLeakAutoVar::checkScope(const Token * const startToken,
                     varInfo2.erase(tok->tokAt(2)->varId());
                     if (notzero.find(tok->tokAt(2)->varId()) != notzero.end())
                         varInfo2.clear();
-                } else if (Token::Match(tok->next(), "( ! %var% )|&&"))
+                } else if (Token::Match(tok->next(), "( ! %var% )|&&")) {
                     varInfo1.erase(tok->tokAt(3)->varId());
+                } else if (Token::Match(tok->next(), "( %var% ( ! %var% ) )|&&")) {
+                    varInfo1.erase(tok->tokAt(5)->varId());
+                }
 
                 checkScope(tok2->next(), &varInfo1, notzero);
                 tok2 = tok2->linkAt(1);
diff --git a/test/testleakautovar.cpp b/test/testleakautovar.cpp
index e9e6b0f35..bfebd5d0f 100644
--- a/test/testleakautovar.cpp
+++ b/test/testleakautovar.cpp
@@ -299,6 +299,14 @@ private:
               "    free(p);\n"
               "}");
         ASSERT_EQUALS("", errout.str());
+
+        // #3866 - UNLIKELY
+        check("void f() {\n"
+              "    char *p = malloc(10);\n"
+              "    if (UNLIKELY(!p)) { return; }\n"
+              "    free(p);\n"
+              "}");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void ifelse4() {