diff --git a/Changes b/Changes
index f4d44b32f..769aeafe8 100644
--- a/Changes
+++ b/Changes
@@ -7,6 +7,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ****  Fix installing missing manpages, bug908.  [Ahmed El-Mahmoudy]
 
+****  Fix core dump in sync-async warnings, bug911.  [Sebastian Dressler]
+
 
 * Verilator 3.872 2015-04-05
 
diff --git a/src/V3Gate.cpp b/src/V3Gate.cpp
index e933ae4e5..7ccdb3770 100644
--- a/src/V3Gate.cpp
+++ b/src/V3Gate.cpp
@@ -362,6 +362,7 @@ private:
 	nodep->iterateChildren(*this);
 	//if (debug()>6) m_graph.dump();
 	if (debug()>6) m_graph.dumpDotFilePrefixed("gate_pre");
+	warnSignals();  // Before loss of sync/async pointers
 	m_graph.removeRedundantEdgesSum(&V3GraphEdge::followAlwaysTrue);
 	m_graph.dumpDotFilePrefixed("gate_simp");
 	// Find gate interconnect and optimize
@@ -373,8 +374,7 @@ private:
 	// Remove redundant logic
 	if (v3Global.opt.oDedupe()) dedupe();
 	if (v3Global.opt.oAssemble()) mergeAssigns();
-	// Warn
-	warnSignals();
+	// Consumption warnings
 	consumedMark();
 	m_graph.dumpDotFilePrefixed("gate_opt");
 	// Rewrite assignments