diff --git a/src/checkbufferoverrun.cpp b/src/checkbufferoverrun.cpp
index eb0bc27f6..c39ac8078 100644
--- a/src/checkbufferoverrun.cpp
+++ b/src/checkbufferoverrun.cpp
@@ -431,11 +431,17 @@ void CheckBufferOverrun::checkScope(const Token *tok, const char *varname[], con
             {
                 len = 0;
                 const Token *end = tok->next()->link();
+                bool argumentAlreadyChecked = false;
                 for (const Token *tok2 = tok->tokAt(6); tok2 && tok2 != end; tok2 = tok2->next())
                 {
-                    if (tok2->str()[0] == '\"')
+                    if (tok2->str() == ",")
+                    {
+                        argumentAlreadyChecked = false;
+                    }
+                    else if (Token::Match(tok2, "%str%") && argumentAlreadyChecked == false)
                     {
                         len += (int)Token::getStrLength(tok2);
+                        argumentAlreadyChecked = true;
                     }
                 }
                 if (len >= (int)size)
diff --git a/test/testbufferoverrun.cpp b/test/testbufferoverrun.cpp
index cac5ec67a..af65a6c88 100644
--- a/test/testbufferoverrun.cpp
+++ b/test/testbufferoverrun.cpp
@@ -100,6 +100,7 @@ private:
         TEST_CASE(sprintf2);
         TEST_CASE(sprintf3);
         TEST_CASE(sprintf4);
+        TEST_CASE(sprintf5);
 
         TEST_CASE(snprintf1);
         TEST_CASE(snprintf2);
@@ -648,6 +649,17 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void sprintf5()
+    {
+        // ticket #729
+        check("void f(bool condition)\n"
+              "{\n"
+              "    char buf[3];\n"
+              "    sprintf(buf, \"%s\", condition ? \"11\" : \"22\");\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void snprintf1()
     {
         check("void f()\n"