diff --git a/libvncclient/rfbproto.c b/libvncclient/rfbproto.c
index 83ba3a5..df8eb2f 100644
--- a/libvncclient/rfbproto.c
+++ b/libvncclient/rfbproto.c
@@ -47,6 +47,9 @@
 #endif
 #endif
 #ifdef LIBVNCSERVER_HAVE_LIBJPEG
+#ifdef _RPCNDR_H /* This Windows header typedefs 'boolean', jpeglib has to know */
+#define HAVE_BOOLEAN
+#endif
 #include <jpeglib.h>
 #endif
 #include <stdarg.h>
diff --git a/libvncserver/tight.c b/libvncserver/tight.c
index 54eb921..bb033c3 100644
--- a/libvncserver/tight.c
+++ b/libvncserver/tight.c
@@ -34,6 +34,9 @@
 #define NEEDFAR_POINTERS
 #endif
 
+#ifdef _RPCNDR_H /* This Windows header typedefs 'boolean', jpeglib has to know */
+#define HAVE_BOOLEAN
+#endif
 #include <jpeglib.h>
 
 /* Note: The following constant should not be changed. */