diff --git a/Cantera/src/equil/vcs_phaseStability.cpp b/Cantera/src/equil/vcs_phaseStability.cpp
index 28a76fbe5..60f7c0f58 100644
--- a/Cantera/src/equil/vcs_phaseStability.cpp
+++ b/Cantera/src/equil/vcs_phaseStability.cpp
@@ -18,6 +18,7 @@
 #include <cstdlib>
 #include <cmath>
 #include <vector>
+#include <cstring>
 
 using namespace std;