diff --git a/Changes b/Changes
index a84e08d96..ada6b668e 100644
--- a/Changes
+++ b/Changes
@@ -10,6 +10,8 @@ indicates the contributor was also the author of the fix; Thanks!
 
 ***   Report MULTIDRIVEN on memories set in multiple clock domains.
 
+****  Fix core dump with over 100 deep UNOPTFLAT, bug432.  [Joe Eiler]
+
 
 * Verilator 3.831 2012/01/20
 
diff --git a/src/V3GraphAlg.cpp b/src/V3GraphAlg.cpp
index eab558ee8..77c35bee6 100644
--- a/src/V3GraphAlg.cpp
+++ b/src/V3GraphAlg.cpp
@@ -344,8 +344,9 @@ private:
 	// When we hit ourself again, return the list of all loops
 	if (m_done) return;
 
-	m_callTrace.reserve(currentRank+10);   // Leave slop for speed
-	m_callTrace[currentRank++] = vertexp;
+	// Can't just reserve(), unless we modify size() before setting array directly
+	while (m_callTrace.size() <= currentRank) m_callTrace.push_back(vertexp);
+	m_callTrace[currentRank++] = vertexp;	
 
 	if (vertexp->user() == 1) {
 	    for (unsigned i=0; i<currentRank; i++) {