diff --git a/turbojpeg.c b/turbojpeg.c
index 4442503f..de0c88b8 100644
--- a/turbojpeg.c
+++ b/turbojpeg.c
@@ -42,6 +42,10 @@
 #include "transupp.h"
 #include "./jpegcomp.h"
 
+#ifdef _WIN32
+#define setenv(envvar, value, dummy) putenv(envvar"="value)
+#endif
+
 extern void jpeg_mem_dest_tj(j_compress_ptr, unsigned char **,
 	unsigned long *, boolean);
 extern void jpeg_mem_src_tj(j_decompress_ptr, unsigned char *, unsigned long);