diff --git a/src/g_shared/a_quake.cpp b/src/g_shared/a_quake.cpp
index 1f13ffd61..8fe060cd7 100644
--- a/src/g_shared/a_quake.cpp
+++ b/src/g_shared/a_quake.cpp
@@ -68,6 +68,8 @@ void DEarthquake::Serialize (FArchive &arc)
 		m_IntensityZ = 0;
 		m_Flags = 0;
 	}
+	if (SaveVersion < 4520)
+		m_CountdownStart = 0;
 	else
 	{
 		arc << m_IntensityY << m_IntensityZ << m_Flags;
diff --git a/src/version.h b/src/version.h
index 2be4787ee..794bdcec8 100644
--- a/src/version.h
+++ b/src/version.h
@@ -76,7 +76,7 @@ const char *GetVersionString();
 
 // Use 4500 as the base git save version, since it's higher than the
 // SVN revision ever got.
-#define SAVEVER 4519
+#define SAVEVER 4520
 
 #define SAVEVERSTRINGIFY2(x) #x
 #define SAVEVERSTRINGIFY(x) SAVEVERSTRINGIFY2(x)