diff --git a/src_main/math/pievaluator.cpp b/src_main/math/pievaluator.cpp
index 6e36739c..9db4768d 100755
--- a/src_main/math/pievaluator.cpp
+++ b/src_main/math/pievaluator.cpp
@@ -105,6 +105,7 @@
  * * clamp(x, a, b) - trim x on range [a, b]
  * * step(x, s) - 0 if x < s, else 1
  * * mix(x, a, b) - interpolate between a and b linear for x (a * (1 - x) + b * x)
+ * * round(x) - round
  *
  * There are some built-in constans:
  * * i (imaginary 1)
@@ -161,6 +162,7 @@ PIEvaluatorContent::PIEvaluatorContent() {
 	addFunction("step", 2); // (x,s) =     x >= s ? 1. : 0.  (1 if 'x' >= 's', else 0)
 	addFunction("mix", 3); // (x,a,b) =    a*(1.-x) + b*x    (interpolate between 'a' and 'b' linear for 'x')
 	addFunction("defined", 1);
+	addFunction("round", 1);
 	clearCustomVariables();
 	//addVariable("n", 0.);
 	//addVariable("x1", 123);
@@ -250,6 +252,7 @@ PIEvaluatorTypes::BaseFunctions PIEvaluatorContent::getBaseFunction(const PIStri
 	if (name == "step") return PIEvaluatorTypes::bfStep;
 	if (name == "mix") return PIEvaluatorTypes::bfMix;
 	if (name == "defined") return PIEvaluatorTypes::bfDefined;
+	if (name == "round") return PIEvaluatorTypes::bfRound;
 	return PIEvaluatorTypes::bfUnknown;
 }
 
@@ -1168,6 +1171,9 @@ inline void PIEvaluator::execFunction(const PIEvaluatorTypes::Instruction & ci)
 	case PIEvaluatorTypes::bfRandomn:
 		tmpvars[oi].value = randomn(value(ci.operators[0]).real(), value(ci.operators[1]).real());
 	break;
+	case PIEvaluatorTypes::bfRound:
+		tmpvars[oi].value = piRoundd(value(ci.operators[0]).real());
+	break;
 	default: break;
 	}
 }
diff --git a/src_main/math/pievaluator.h b/src_main/math/pievaluator.h
index 2a70fbba..299e43c0 100755
--- a/src_main/math/pievaluator.h
+++ b/src_main/math/pievaluator.h
@@ -46,6 +46,7 @@ namespace PIEvaluatorTypes {
 						bfRad, bfDeg, bfJ0, bfJ1, bfJN,
 						bfY0, bfY1, bfYN, bfMin, bfMax,
 						bfClamp, bfStep, bfMix, bfDefined,
+						bfRound,
 						bfCustom = 0xFFFF
 	};