diff --git a/panda/src/express/datagram.I b/panda/src/express/datagram.I
index 8c555c777d..350fa3d30c 100644
--- a/panda/src/express/datagram.I
+++ b/panda/src/express/datagram.I
@@ -11,30 +11,11 @@
  * @date 2000-06-06
  */
 
-/**
- * Constructs an empty datagram.
- */
-INLINE Datagram::
-Datagram() :
-#ifdef STDFLOAT_DOUBLE
-  _stdfloat_double(true)
-#else
-  _stdfloat_double(false)
-#endif
-{
-}
-
 /**
  * Constructs a datagram from an existing block of data.
  */
 INLINE Datagram::
-Datagram(const void *data, size_t size) :
-#ifdef STDFLOAT_DOUBLE
-  _stdfloat_double(true)
-#else
-  _stdfloat_double(false)
-#endif
-{
+Datagram(const void *data, size_t size) {
   append_data(data, size);
 }
 
@@ -43,13 +24,7 @@ Datagram(const void *data, size_t size) :
  */
 INLINE Datagram::
 Datagram(vector_uchar data) :
-  _data(std::move(data)),
-#ifdef STDFLOAT_DOUBLE
-  _stdfloat_double(true)
-#else
-  _stdfloat_double(false)
-#endif
-{
+  _data(std::move(data)) {
 }
 
 /**
diff --git a/panda/src/express/datagram.h b/panda/src/express/datagram.h
index b2a3acb363..420175c114 100644
--- a/panda/src/express/datagram.h
+++ b/panda/src/express/datagram.h
@@ -37,7 +37,7 @@
  */
 class EXPCL_PANDA_EXPRESS Datagram : public TypedObject {
 PUBLISHED:
-  INLINE Datagram();
+  INLINE Datagram() = default;
   INLINE Datagram(const void *data, size_t size);
   INLINE explicit Datagram(vector_uchar data);
   Datagram(const Datagram &copy) = default;
@@ -114,7 +114,12 @@ PUBLISHED:
 
 private:
   PTA_uchar _data;
-  bool _stdfloat_double;
+
+#ifdef STDFLOAT_DOUBLE
+  bool _stdfloat_double = true;
+#else
+  bool _stdfloat_double = false;
+#endif
 
 public: