diff --git a/lib/checkother.cpp b/lib/checkother.cpp
index ccff0c21c..025206093 100644
--- a/lib/checkother.cpp
+++ b/lib/checkother.cpp
@@ -645,7 +645,7 @@ void CheckOther::checkPipeParameterSizeError(const Token *tok, const std::string
 }
 
 //-----------------------------------------------------------------------------
-// check usleep(), which is allowed to be called with in a range of [0,1000000]
+// check usleep(), which is allowed to be called with in a range of [0,999999]
 //
 // Reference:
 // - http://man7.org/linux/man-pages/man3/usleep.3.html
@@ -663,7 +663,7 @@ void CheckOther::checkSleepTimeInterval()
             if (Token::Match(tok, "usleep ( %num% )")) {
                 const Token * const numTok = tok->tokAt(2);
                 MathLib::bigint value = MathLib::toLongNumber(numTok->str());
-                if (value > 1000000) {
+                if (value > 999999) { // less than 1 million
                     checkSleepTimeError(numTok, numTok->str());
                 }
             }
diff --git a/test/testother.cpp b/test/testother.cpp
index 3482c4712..405a8a49d 100644
--- a/test/testother.cpp
+++ b/test/testother.cpp
@@ -7335,12 +7335,22 @@ private:
     }
 
     void checkSleepTimeIntervall() {
-        // check usleep(), which is allowed to be called with in a range of [0,1000000]
+        // check usleep(), which is allowed to be called with in a range of [0,999999]
         check("void f(){\n"
               "usleep(10000);\n"
               "}",NULL,false,false,true);
         ASSERT_EQUALS("", errout.str());
 
+        check("void f(){\n"
+              "usleep(999999);\n"
+              "}",NULL,false,false,true);
+        ASSERT_EQUALS("", errout.str());
+
+        check("void f(){\n"
+              "usleep(1000000);\n"
+              "}",NULL,false,false,true);
+        ASSERT_EQUALS("[test.cpp:2]: (error) The argument of usleep must be less than 1000000.\n", errout.str());
+
         check("void f(){\n"
               "usleep(1000001);\n"
               "}",NULL,false,false,true);