diff --git a/client/main.c b/client/main.c
index 50c4320b..5a62fd9e 100644
--- a/client/main.c
+++ b/client/main.c
@@ -93,7 +93,7 @@ int renderThread(void * unused)
     if (memcmp(state.shm->magic, KVMGFX_HEADER_MAGIC, sizeof(KVMGFX_HEADER_MAGIC)) != 0)
       continue;
 
-    if (state.shm->version != 2)
+    if (state.shm->version != KVMGFX_HEADER_VERSION)
       continue;
 
     bool ready = false;
diff --git a/common/KVMGFXHeader.h b/common/KVMGFXHeader.h
index d4cda089..9174ce3a 100644
--- a/common/KVMGFXHeader.h
+++ b/common/KVMGFXHeader.h
@@ -19,7 +19,8 @@ Place, Suite 330, Boston, MA 02111-1307 USA
 
 #include <stdint.h>
 
-#define KVMGFX_HEADER_MAGIC "[[KVMGFXHeader]]"
+#define KVMGFX_HEADER_MAGIC   "[[KVMGFXHeader]]"
+#define KVMGFX_HEADER_VERSION 3
 
 typedef enum FrameType
 {