diff --git a/include/pybind11/detail/common.h b/include/pybind11/detail/common.h
index 8006a8df..dfd5b569 100644
--- a/include/pybind11/detail/common.h
+++ b/include/pybind11/detail/common.h
@@ -15,7 +15,7 @@
 
 // Similar to Python's convention: https://docs.python.org/3/c-api/apiabiversion.html
 // Additional convention: 0xD = dev
-#define PYBIND11_VERSION_HEX 0x020701D1
+#define PYBIND11_VERSION_HEX 0x02070100
 
 #define PYBIND11_NAMESPACE_BEGIN(name) namespace name {
 #define PYBIND11_NAMESPACE_END(name) }