diff --git a/Include/pyport.h b/Include/pyport.h
--- a/Include/pyport.h
+++ b/Include/pyport.h
@@ -557,6 +557,28 @@
         _Py_set_387controlword(old_387controlword)
 #endif
 
+/* get and set x87 control word for VisualStudio/x86 */
+#if defined(_MSC_VER) && !defined(_WIN64) /* x87 not supported in 64-bit */
+#define HAVE_PY_SET_53BIT_PRECISION 1
+#define _Py_SET_53BIT_PRECISION_HEADER \
+    unsigned int old_387controlword, new_387controlword
+/* We are using the __control87_2 function to set only the x87 controlword.
+   SSE controlword is unaffected. */
+#define _Py_SET_53BIT_PRECISION_START \
+    do {                                                                      \
+        __control87_2(0, 0, &old_387controlword, NULL);                       \
+        new_387controlword =                                                  \
+          (old_387controlword&(_MCW_DN|_MCW_EM|_MCW_IC)) | (_PC_53|_RC_NEAR); \
+        if (new_387controlword != old_387controlword)                         \
+            __control87_2(_PC_53|_RC_NEAR, _MCW_PC|_MCW_RC,                   \
+                          &new_387controlword, NULL);                         \
+    } while (0)
+#define _Py_SET_53BIT_PRECISION_END  \
+        if (new_387controlword != old_387controlword)          \
+            __control87_2(old_387controlword, _MCW_PC|_MCW_RC, \
+                          &new_387controlword, NULL)
+#endif
+
 /* default definitions are empty */
 #ifndef HAVE_PY_SET_53BIT_PRECISION
 #define _Py_SET_53BIT_PRECISION_HEADER