diff --git a/putty.h b/putty.h
index 4b85aa90..0f2911c5 100644
--- a/putty.h
+++ b/putty.h
@@ -599,6 +599,12 @@ char *cp_enumerate (int index);
 char *cp_name(int codepage);
 void get_unitab(int codepage, wchar_t * unitab, int ftype);
 
+/*
+ * Exports from wcwidth.c
+ */
+int wcwidth(wchar_t ucs);
+int wcswidth(const wchar_t *pwcs, size_t n);
+
 /*
  * Exports from mscrypto.c
  */
diff --git a/terminal.c b/terminal.c
index c7d05c50..3fcff47f 100644
--- a/terminal.c
+++ b/terminal.c
@@ -1542,7 +1542,6 @@ void term_out(Terminal *term)
 		    term->logctx)
 		    logtraffic(term->logctx, (unsigned char) c, LGTYP_ASCII);
 		{
-		    extern int wcwidth(wchar_t ucs);
 		    int width = 0;
 		    if (DIRECT_CHAR(c))
 			width = 1;
diff --git a/wcwidth.c b/wcwidth.c
index 2d7a0935..ed7529ba 100644
--- a/wcwidth.c
+++ b/wcwidth.c
@@ -8,6 +8,8 @@
 
 #include <stddef.h>
 
+#include "putty.h"
+
 struct interval {
   unsigned short first;
   unsigned short last;