diff --git a/lib/checkunusedvar.cpp b/lib/checkunusedvar.cpp
index 5dbef87df..d7dbb3976 100644
--- a/lib/checkunusedvar.cpp
+++ b/lib/checkunusedvar.cpp
@@ -445,7 +445,8 @@ static const Token* doAssignment(Variables &variables, const Token *tok, bool de
                             // not in same scope as declaration
                             else {
                                 // no other assignment in this scope
-                                if (var1->_assignments.find(scope) == var1->_assignments.end()) {
+                                if (var1->_assignments.find(scope) == var1->_assignments.end() ||
+                                    scope->type == Scope::eSwitch) {
                                     // nothing to replace
                                     if (var1->_assignments.empty())
                                         replace = false;
diff --git a/test/testunusedvar.cpp b/test/testunusedvar.cpp
index 87ffd5ab8..d2fdddee7 100644
--- a/test/testunusedvar.cpp
+++ b/test/testunusedvar.cpp
@@ -138,6 +138,7 @@ private:
         TEST_CASE(localvarFunction); // ticket #1799
         TEST_CASE(localvarIfNOT);    // #3104 - if ( NOT var )
         TEST_CASE(localvarAnd);      // #3672
+        TEST_CASE(localvarSwitch);   // #3744 - false positive when localvar is used in switch
     }
 
     void checkStructMemberUsage(const char code[]) {
@@ -3078,6 +3079,22 @@ private:
                               "}");
         ASSERT_EQUALS("", errout.str());
     }
+
+    void localvarSwitch() { // #3744 - false positive when used in switch
+        functionVariableUsage("const char *f(int x) {\n"
+                              "    const char a[] = \"abc\";\n"
+                              "    const char def[] = \"def\";\n"
+                              "    const char *ptr;\n"
+                              "    switch(x) {\n"
+                              "        case 1:  ptr=a; break;\n"
+                              "        default: ptr=def; break;\n"
+                              "    }\n"
+                              "    return ptr;\n"
+                              "}");
+
+        // Don't write an error that "a" is not used
+        ASSERT_EQUALS("", errout.str());
+    }
 };
 
 REGISTER_TEST(TestUnusedVar)