diff --git a/Changes b/Changes
index b77ce5895..2db9184d1 100644
--- a/Changes
+++ b/Changes
@@ -15,6 +15,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ****  Fix using short parameter names on negative params, bug1022. [Duraid Madina]
 
+****  Fix read-after-free error, bug1031. [Johan Bjork]
+
 
 * Verilator 3.880 2015-12-19
 
diff --git a/src/V3Scope.cpp b/src/V3Scope.cpp
index 644b5f88d..3498e568a 100644
--- a/src/V3Scope.cpp
+++ b/src/V3Scope.cpp
@@ -334,7 +334,9 @@ private:
 	    nodep->iterateChildren(*this);
 	} else {
 	    // A block that was just moved under a scope, Kill it.
-	    nodep->unlinkFrBack()->deleteTree(); VL_DANGLING(nodep);
+	    // Certain nodes can be referenced later in this pass, notably
+	    // an FTaskRef needs to access the FTask to find the cloned task
+	    pushDeletep(nodep->unlinkFrBack()); VL_DANGLING(nodep);
 	}
     }