diff --git a/Source/Core/Common/MathUtil.h b/Source/Core/Common/MathUtil.h
index 1efeca4066..c9bd3e09b4 100644
--- a/Source/Core/Common/MathUtil.h
+++ b/Source/Core/Common/MathUtil.h
@@ -56,19 +56,6 @@ union IntFloat {
 	explicit IntFloat(float _f) : f(_f) {}
 };
 
-inline bool IsINF(double d)
-{
-	IntDouble x(d);
-	return (x.i & ~DOUBLE_SIGN) == DOUBLE_EXP;
-}
-
-inline bool IsNAN(double d)
-{
-	IntDouble x(d);
-	return ((x.i & DOUBLE_EXP) == DOUBLE_EXP) &&
-	       ((x.i & DOUBLE_FRAC) != DOUBLE_ZERO);
-}
-
 inline bool IsQNAN(double d)
 {
 	IntDouble x(d);
diff --git a/Source/UnitTests/Common/MathUtilTest.cpp b/Source/UnitTests/Common/MathUtilTest.cpp
index c5f2f20b65..f7427cc8c3 100644
--- a/Source/UnitTests/Common/MathUtilTest.cpp
+++ b/Source/UnitTests/Common/MathUtilTest.cpp
@@ -20,18 +20,6 @@ TEST(MathUtil, Clamp)
 	EXPECT_EQ(0.0, MathUtil::Clamp(-1.0, 0.0, 2.0));
 }
 
-TEST(MathUtil, IsINF)
-{
-	EXPECT_TRUE(MathUtil::IsINF(+std::numeric_limits<double>::infinity()));
-	EXPECT_TRUE(MathUtil::IsINF(-std::numeric_limits<double>::infinity()));
-}
-
-TEST(MathUtil, IsNAN)
-{
-	EXPECT_TRUE(MathUtil::IsNAN(std::numeric_limits<double>::quiet_NaN()));
-	EXPECT_TRUE(MathUtil::IsNAN(std::numeric_limits<double>::signaling_NaN()));
-}
-
 TEST(MathUtil, IsQNAN)
 {
 	EXPECT_TRUE(MathUtil::IsQNAN(std::numeric_limits<double>::quiet_NaN()));