diff --git a/src/common/torint.h b/src/common/torint.h
index 6ec53ed127..f520072aa2 100644
--- a/src/common/torint.h
+++ b/src/common/torint.h
@@ -41,6 +41,11 @@
 #include <inttypes.h>
 #endif
 
+#ifdef MS_WINDOWS
+/* Windows likes to capitalize ssize_t.  Charming. */
+#define ssize_t SSIZE_T
+#endif
+
 #if (SIZEOF_INT8_T != 0)
 #define HAVE_INT8_T
 #endif
diff --git a/src/or/or.h b/src/or/or.h
index 92fac0a159..679123d75b 100644
--- a/src/or/or.h
+++ b/src/or/or.h
@@ -110,7 +110,6 @@
 #include <process.h>
 #include <direct.h>
 #include <windows.h>
-#define ssize_t SSIZE_T
 #define snprintf _snprintf
 #endif