diff --git a/lib/checkbufferoverrun.cpp b/lib/checkbufferoverrun.cpp
index fa2ef130e..ecf36dfa9 100644
--- a/lib/checkbufferoverrun.cpp
+++ b/lib/checkbufferoverrun.cpp
@@ -1794,7 +1794,9 @@ bool CheckBufferOverrun::ArrayInfo::declare(const Token *tok, const Tokenizer &t
     if (!tok->isName())
         return false;
 
-    while (tok && (tok->str() == "static" || tok->str() == "const"))
+    while (tok && (tok->str() == "static" ||
+                   tok->str() == "const" ||
+                   tok->str() == "extern"))
         tok = tok->next();
 
     int ivar = 0;
diff --git a/test/testbufferoverrun.cpp b/test/testbufferoverrun.cpp
index d4cbedba1..7982d8bad 100644
--- a/test/testbufferoverrun.cpp
+++ b/test/testbufferoverrun.cpp
@@ -1700,6 +1700,13 @@ private:
               "    strcpy(x, \"12\");\n"
               "}\n");
         ASSERT_EQUALS("", errout.str());
+
+        check("extern char a[10];\n"
+              "void f() {\n"
+              "    char b[25] = {0};\n"
+              "    std::memcpy(b, a, sizeof(a));\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
     }
 
     void sprintf1()