diff --git a/ispc.h b/ispc.h
index 041f53a1..05633d03 100644
--- a/ispc.h
+++ b/ispc.h
@@ -38,7 +38,7 @@
 #ifndef ISPC_H
 #define ISPC_H
 
-#define ISPC_VERSION "1.3.0"
+#define ISPC_VERSION "1.3.1dev"
 
 #if !defined(LLVM_3_0) && !defined(LLVM_3_1) && !defined(LLVM_3_2)
 #error "Only LLVM 3.0, 3.1, and the 3.2 development branch are supported"