diff --git a/prism/src/explicit/CTMCModelChecker.java b/prism/src/explicit/CTMCModelChecker.java
index 2ae0b99e..219c27a2 100644
--- a/prism/src/explicit/CTMCModelChecker.java
+++ b/prism/src/explicit/CTMCModelChecker.java
@@ -56,12 +56,6 @@ public class CTMCModelChecker extends DTMCModelChecker
 		StateValues probs = null;
 		ModelCheckerResult tmpRes = null, res = null;
 
-		// check not LTL
-		if (!(expr.getOperand1().getType() instanceof TypeBool))
-			throw new PrismException("Invalid path formula");
-		if (!(expr.getOperand2().getType() instanceof TypeBool))
-			throw new PrismException("Invalid path formula");
-
 		// get info from bounded until
 
 		// lower bound is 0 if not specified
diff --git a/prism/src/prism/StochModelChecker.java b/prism/src/prism/StochModelChecker.java
index 5ce4aeee..a2e4ac01 100644
--- a/prism/src/prism/StochModelChecker.java
+++ b/prism/src/prism/StochModelChecker.java
@@ -86,12 +86,6 @@ public class StochModelChecker extends ProbModelChecker
 		JDDNode b1, b2, tmp;
 		StateValues tmpProbs = null, probs = null;
 
-		// check not LTL
-		if (!(expr.getOperand1().getType() instanceof TypeBool))
-			throw new PrismException("Invalid path formula");
-		if (!(expr.getOperand2().getType() instanceof TypeBool))
-			throw new PrismException("Invalid path formula");
-
 		// get info from bounded until
 
 		// lower bound is 0 if not specified