diff --git a/Common/MathParser.cpp b/Common/MathParser.cpp
index e47a9fca..a8a0c922 100644
--- a/Common/MathParser.cpp
+++ b/Common/MathParser.cpp
@@ -99,7 +99,6 @@ struct Function
 };
 
 static double frac(double x);
-static double trunc(double x);
 static double rad(double deg);
 static double sgn(double x);
 static double neg(double x);
@@ -848,11 +847,6 @@ static double frac(double x)
 	return modf(x, &y);
 }
 
-static double trunc(double x)
-{
-	return (x >= 0.0) ? floor(x) : ceil(x);
-}
-
 static double rad(double deg)
 {
 	return (deg / 180.0) * M_PI;
diff --git a/Common/MathParser_Test.cpp b/Common/MathParser_Test.cpp
index a1325ef2..3ba60239 100644
--- a/Common/MathParser_Test.cpp
+++ b/Common/MathParser_Test.cpp
@@ -61,6 +61,9 @@ public:
 		ParseAssert(L"1 ? 2 : 1 ? 4 : 5", 4.0);
 		ParseAssert(L"1 ? 2 : (1 ? 4 : 5)", 2.0);
 		ParseAssert(L"0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:(0?1:5)))))))))))))))))))))))))))))", 5.0);
+		ParseAssert(L"trunc(1.5)", 1.0);
+		ParseAssert(L"trunc(-1.5)", -1.0);
+		ParseAssert(L"round(1.555, 2)", 1.56);
 
 		double value;