diff --git a/src/cxx_stubs/SFImage_stub.cpp b/src/cxx_stubs/SFImage_stub.cpp
index e3c717f..4f85a41 100644
--- a/src/cxx_stubs/SFImage_stub.cpp
+++ b/src/cxx_stubs/SFImage_stub.cpp
@@ -132,8 +132,7 @@ caml_sfImage_getPixelsStr(value sf_image)
     unsigned int len = width * height * 4;
     const sf::Uint8 *img_data = SfImage_val(sf_image)->getPixelsPtr();
     if (img_data == NULL) caml_failwith("SFImage.getPixelsStr");
-    img_str = caml_alloc_string(len);
-    memcpy(String_val(img_str), img_data, len);
+    img_str = caml_alloc_initialized_string(len, (const char *)img_data);
     CAMLreturn(img_str);
 }
 
diff --git a/src/cxx_stubs/SFPacket_stub.cpp b/src/cxx_stubs/SFPacket_stub.cpp
index 9c963c4..49ec683 100644
--- a/src/cxx_stubs/SFPacket_stub.cpp
+++ b/src/cxx_stubs/SFPacket_stub.cpp
@@ -75,8 +75,7 @@ caml_sfPacket_getData(value packet)
     CAMLlocal1(str);
     const std::size_t size = SfPacket_val(packet)->getDataSize();
     const void *ptr = SfPacket_val(packet)->getData();
-    str = caml_alloc_string(size);
-    memcpy(String_val(str), ptr, size);
+    str = caml_alloc_initialized_string(size, (const char *)ptr);
     CAMLreturn(str);
 }
 
@@ -163,15 +162,14 @@ caml_sfPacket_readString(value packet)
     if (size != len) {
         caml_failwith("SFPacket.readString: length mismatch");
     }
-    str = caml_alloc_string(size);
-    memcpy(String_val(str), s.c_str(), size);
+    str = caml_alloc_initialized_string(size, s.c_str());
     CAMLreturn(str);
 }
 
 CAMLextern_C value
 caml_sfPacket_writeString(value packet, value str)
 {
-    char *s = String_val(str);
+    const char *s = String_val(str);
     sf::Uint32 len = caml_string_length(str);
     *SfPacket_val(packet) << len;
     *SfPacket_val(packet) << s;
diff --git a/src/cxx_stubs/SFTcpSocket_stub.cpp b/src/cxx_stubs/SFTcpSocket_stub.cpp
index d146e8d..6dc65dd 100644
--- a/src/cxx_stubs/SFTcpSocket_stub.cpp
+++ b/src/cxx_stubs/SFTcpSocket_stub.cpp
@@ -31,6 +31,7 @@
 #include "SFPacket_stub.hpp"
 #include "SFTime_stub.hpp"
 
+
 /* sf::TcpSocket */
 
 CAMLextern_C value
@@ -111,7 +112,7 @@ caml_sfTcpSocket_receive(value socket, value data)
     std::size_t sizeReceived;
     sf::Socket::Status st =
         SfTcpSocket_val(socket)->receive(
-            String_val(data),
+            Bytes_val(data),
             caml_string_length(data),
             sizeReceived);
     check_sfSocketStatus(st, "SFTcpSocket")
diff --git a/src/cxx_stubs/sf_caml_conv.hpp b/src/cxx_stubs/sf_caml_conv.hpp
index df556c8..be55524 100644
--- a/src/cxx_stubs/sf_caml_conv.hpp
+++ b/src/cxx_stubs/sf_caml_conv.hpp
@@ -14,6 +14,10 @@ value Val_some(value v);
 
 #define UInt_val(v) ((unsigned int) Long_val(v))
 
+#if OCAML_VERSION < 40600
+#define Bytes_val(x) String_val(x)
+#endif
+
 /*
 static inline
 unsigned int UInt_val(value v) {
diff --git a/src/cxx_stubs/sf_caml_incs.hpp b/src/cxx_stubs/sf_caml_incs.hpp
index 8c46f62..764b4ca 100644
--- a/src/cxx_stubs/sf_caml_incs.hpp
+++ b/src/cxx_stubs/sf_caml_incs.hpp
@@ -12,6 +12,7 @@ extern "C" {
 #include <caml/signals.h>
 #include <caml/custom.h>
 #include <caml/callback.h>
+#include <caml/version.h>
 }
 
 #define CAMLextern_C extern "C"