diff --git a/src/checkbufferoverrun.cpp b/src/checkbufferoverrun.cpp
index cfb044a18..019f67a2d 100644
--- a/src/checkbufferoverrun.cpp
+++ b/src/checkbufferoverrun.cpp
@@ -30,6 +30,7 @@
 #include <sstream>
 #include <list>
 #include <cstring>
+#include <cctype>
 
 
 #include <cstdlib>     // <- strtoul
@@ -407,8 +408,15 @@ void CheckBufferOverrun::checkScope(const Token *tok, const char *varname[], con
                 }
                 else if (*fmt == '%')
                 {
+                    ++fmt;
+
+                    // skip field width
+                    while (std::isdigit(*fmt)) {
+                        ++fmt;
+                    }
+
                     // FIXME: better handling for format specifiers
-                    fmt += 2;
+                    ++fmt;
                     continue;
                 }
                 ++fmt;
diff --git a/test/testbufferoverrun.cpp b/test/testbufferoverrun.cpp
index b3bd3ebab..db30a8461 100644
--- a/test/testbufferoverrun.cpp
+++ b/test/testbufferoverrun.cpp
@@ -98,6 +98,7 @@ private:
         TEST_CASE(sprintf1);
         TEST_CASE(sprintf2);
         TEST_CASE(sprintf3);
+        TEST_CASE(sprintf4);
 
         TEST_CASE(snprintf1);
         TEST_CASE(snprintf2);
@@ -622,6 +623,17 @@ private:
         ASSERT_EQUALS("", errout.str());
     }
 
+    void sprintf4()
+    {
+        // ticket #690
+        check("void f()\n"
+              "{\n"
+              "    char a[3];\n"
+              "    sprintf(a, \"%02ld\", 99);\n"
+              "}\n");
+        ASSERT_EQUALS("", errout.str());
+    }
+
     void snprintf1()
     {
         check("void f()\n"