diff --git a/bench1.cpp b/bench1.cpp
index ce0024a6..0a03ce7a 100644
--- a/bench1.cpp
+++ b/bench1.cpp
@@ -61,7 +61,7 @@ void OutputResultBytes(const char *name, double length, double timeTaken)
 	std::cout << "<TD>" << std::setprecision(0) << std::setiosflags(std::ios::fixed) << mbs;
 	if (g_hertz > 1.0f)
 		std::cout << "<TD>" << std::setprecision(1) << std::setiosflags(std::ios::fixed) << timeTaken * g_hertz / length;
-	g_logTotal += std::log(mbs);
+	g_logTotal += ::log(mbs);
 	g_logCount++;
 }
 
@@ -97,7 +97,7 @@ void OutputResultOperations(const char *name, const char *operation, bool pc, un
 	if (g_hertz > 1.0f)
 		std::cout << "<TD>" << std::setprecision(2) << std::setiosflags(std::ios::fixed) << timeTaken * g_hertz / iterations / 1000000;
 
-	g_logTotal += std::log(iterations/timeTaken);
+	g_logTotal += ::log(iterations/timeTaken);
 	g_logCount++;
 }
 
@@ -373,7 +373,7 @@ void Benchmark(Test::TestClass suites, double t, double hertz)
 
 	AddHtmlHeader();
 
-	g_testBegin = std::time(NULLPTR);
+	g_testBegin = ::time(NULLPTR);
 
 	if (static_cast<int>(suites) == 0 || static_cast<int>(suites) > TestLast)
 		suites = Test::All;
@@ -399,7 +399,7 @@ void Benchmark(Test::TestClass suites, double t, double hertz)
 		Benchmark3(t, hertz);
 	}
 
-	g_testEnd = std::time(NULLPTR);
+	g_testEnd = ::time(NULLPTR);
 
 	{
 		StreamState state(std::cout);
diff --git a/nbtheory.cpp b/nbtheory.cpp
index 010f8e14..c3d43757 100644
--- a/nbtheory.cpp
+++ b/nbtheory.cpp
@@ -1023,14 +1023,14 @@ unsigned int FactoringWorkFactor(unsigned int n)
 	// extrapolated from the table in Odlyzko's "The Future of Integer Factorization"
 	// updated to reflect the factoring of RSA-130
 	if (n<5) return 0;
-	else return (unsigned int)(2.4 * std::pow((double)n, 1.0/3.0) * std::pow(std::log(double(n)), 2.0/3.0) - 5);
+	else return (unsigned int)(2.4 * std::pow((double)n, 1.0/3.0) * std::pow(::log(double(n)), 2.0/3.0) - 5);
 }
 
 unsigned int DiscreteLogWorkFactor(unsigned int n)
 {
 	// assuming discrete log takes about the same time as factoring
 	if (n<5) return 0;
-	else return (unsigned int)(2.4 * std::pow((double)n, 1.0/3.0) * std::pow(std::log(double(n)), 2.0/3.0) - 5);
+	else return (unsigned int)(2.4 * std::pow((double)n, 1.0/3.0) * std::pow(::log(double(n)), 2.0/3.0) - 5);
 }
 
 // ********************************************************
diff --git a/rng.cpp b/rng.cpp
index 43d48e28..9a09b59c 100644
--- a/rng.cpp
+++ b/rng.cpp
@@ -76,7 +76,7 @@ X917RNG::X917RNG(BlockTransformation *c, const byte *seed, const byte *determini
 
 	if (!deterministicTimeVector)
 	{
-		time_t tstamp1 = std::time(NULLPTR);
+		time_t tstamp1 = ::time(NULLPTR);
 		xorbuf(m_datetime, (byte *)&tstamp1, UnsignedMin(sizeof(tstamp1), m_size));
 		m_cipher->ProcessBlock(m_datetime);
 		clock_t tstamp2 = clock();
@@ -102,7 +102,7 @@ void X917RNG::GenerateIntoBufferedTransformation(BufferedTransformation &target,
 		{
 			clock_t c = clock();
 			xorbuf(m_datetime, (byte *)&c, UnsignedMin(sizeof(c), m_size));
-			time_t t = std::time(NULLPTR);
+			time_t t = ::time(NULLPTR);
 			xorbuf(m_datetime+m_size-UnsignedMin(sizeof(t), m_size), (byte *)&t, UnsignedMin(sizeof(t), m_size));
 			m_cipher->ProcessBlock(m_datetime);
 		}
@@ -142,7 +142,7 @@ size_t MaurerRandomnessTest::Put2(const byte *inString, size_t length, int /*mes
 	{
 		byte inByte = *inString++;
 		if (n >= Q)
-			sum += std::log(double(n - tab[inByte]));
+			sum += ::log(double(n - tab[inByte]));
 		tab[inByte] = n;
 		n++;
 	}
@@ -154,7 +154,7 @@ double MaurerRandomnessTest::GetTestValue() const
 	if (BytesNeeded() > 0)
 		throw Exception(Exception::OTHER_ERROR, "MaurerRandomnessTest: " + IntToString(BytesNeeded()) + " more bytes of input needed");
 
-	double fTu = (sum/(n-Q))/std::log(2.0);	// this is the test value defined by Maurer
+	double fTu = (sum/(n-Q))/::log(2.0);	// this is the test value defined by Maurer
 
 	double value = fTu * 0.1392;		// arbitrarily normalize it to
 	return value > 1.0 ? 1.0 : value;	// a number between 0 and 1
diff --git a/test.cpp b/test.cpp
index 6ddda84a..4a390811 100644
--- a/test.cpp
+++ b/test.cpp
@@ -855,12 +855,12 @@ bool Validate(int alg, bool thorough, const char *seedInput)
 
 	// Some editors have problems with the '\0' character when redirecting output.
 	//   seedInput is argv[3] when issuing 'cryptest.exe v all <seed>'
-	std::string seed = (seedInput ? seedInput : IntToString(std::time(NULLPTR)));
+	std::string seed = (seedInput ? seedInput : IntToString(::time(NULLPTR)));
 	seed.resize(16, ' ');
 	OFB_Mode<AES>::Encryption& prng = dynamic_cast<OFB_Mode<AES>::Encryption&>(GlobalRNG());
 	prng.SetKeyWithIV((byte *)seed.data(), 16, (byte *)seed.data());
 
-	g_testBegin = std::time(NULLPTR);
+	g_testBegin = ::time(NULLPTR);
 	PrintSeedAndThreads(seed);
 
 	switch (alg)
@@ -964,7 +964,7 @@ bool Validate(int alg, bool thorough, const char *seedInput)
 	default: return false;
 	}
 
-	g_testEnd = std::time(NULLPTR);
+	g_testEnd = ::time(NULLPTR);
 
 	std::cout << "\nSeed used was " << seed << std::endl;
 	std::cout << "Test started at " << TimeToString(g_testBegin) << std::endl;