diff --git a/druntime/src/core/stdc/config.d b/druntime/src/core/stdc/config.d
index 3ab41f834da8..b7396fa13e93 100644
--- a/druntime/src/core/stdc/config.d
+++ b/druntime/src/core/stdc/config.d
@@ -118,82 +118,25 @@ else version (TVOS)
 else version (WatchOS)
     version = Darwin;
 
-version (Windows)
-{
-    enum __c_long  : int;
-    enum __c_ulong : uint;
-
-    alias int   c_long;
-    alias uint  c_ulong;
-
-    alias __c_long   cpp_long;
-    alias __c_ulong  cpp_ulong;
+import core.stdc.datamodel;
 
-    alias long  cpp_longlong;
-    alias ulong cpp_ulonglong;
-}
-else version (Posix)
+static if (dataModel == "ILP32" || dataModel == "LLP64")
 {
-  static if ( (void*).sizeof > int.sizeof )
-  {
-    enum __c_longlong  : long;
-    enum __c_ulonglong : ulong;
-
-    alias long  c_long;
-    alias ulong c_ulong;
-
-    alias long   cpp_long;
-    alias ulong  cpp_ulong;
-
-    alias __c_longlong  cpp_longlong;
-    alias __c_ulonglong cpp_ulonglong;
-  }
-  else
-  {
-    enum __c_long  : int;
-    enum __c_ulong : uint;
-
-    alias int   c_long;
-    alias uint  c_ulong;
-
-    alias __c_long   cpp_long;
-    alias __c_ulong  cpp_ulong;
-
-    alias long  cpp_longlong;
-    alias ulong cpp_ulonglong;
-  }
+    alias c_long = int;
+    alias c_ulong = uint;
 }
-else version (WASI)
+else static if (dataModel == "LP64")
 {
-    static if ( (void*).sizeof > int.sizeof )
-    {
-        enum __c_longlong  : long;
-        enum __c_ulonglong : ulong;
-
-        alias long  c_long;
-        alias ulong c_ulong;
-
-        alias long   cpp_long;
-        alias ulong  cpp_ulong;
-
-        alias __c_longlong  cpp_longlong;
-        alias __c_ulonglong cpp_ulonglong;
-    }
-    else
-    {
-        enum __c_long  : int;
-        enum __c_ulong : uint;
-
-        alias int   c_long;
-        alias uint  c_ulong;
-
-        alias __c_long   cpp_long;
-        alias __c_ulong  cpp_ulong;
-
-        alias long  cpp_longlong;
-        alias ulong cpp_ulonglong;
-    }
+    alias c_long = long;
+    alias c_ulong = ulong;
 }
+else
+    static assert(false, "Unsupported C data model: "~dataModel);
+
+alias cpp_long = c_long;
+alias cpp_ulong = c_long;
+alias cpp_longlong = long;
+alias cpp_ulonglong = ulong;
 
 version (GNU)
     alias c_long_double = real;
diff --git a/druntime/src/core/stdc/datamodel.d b/druntime/src/core/stdc/datamodel.d
new file mode 100644
index 000000000000..3399eafa3f7d
--- /dev/null
+++ b/druntime/src/core/stdc/datamodel.d
@@ -0,0 +1,29 @@
+/**
+ * Defines C data model
+ *
+ * Copyright: Copyright Denis Feklushkin 2024.
+ * License: Distributed under the
+ *      $(LINK2 http://www.boost.org/LICENSE_1_0.txt, Boost Software License 1.0).
+ *    (See accompanying file LICENSE)
+ * Authors:   Denis Feklushkin
+ * Source:    $(DRUNTIMESRC core/stdc/datamodel.d)
+ * Standards: ISO/IEC 9899:1999 (E)
+ */
+
+module core.stdc.datamodel;
+
+version (D_LP64)
+{
+    version (Cygwin)
+        enum dataModel = "LP64";
+    else version (Windows)
+        enum dataModel = "LLP64";
+    else
+        enum dataModel = "LP64";
+}
+else // 32-bit pointers
+{
+    enum dataModel = "ILP32";
+}
+
+static assert(__traits(compiles, dataModel !is null));