diff --git a/src/rinex.c b/src/rinex.c
index 19a7b2619241ffeefec655a037f41d74de34ba94..5d351aad4ab8308d6c173f6dbbf45f2f0506e2da 100644
--- a/src/rinex.c
+++ b/src/rinex.c
@@ -100,7 +100,7 @@
 
 #define SQR(x)      ((x)*(x))
 
-#define NUMSYS      6                   /* number of systems */
+#define NUMSYS      7                   /* number of systems */
 #define MAXRNXLEN   (16*MAXOBSTYPE+4)   /* max rinex record length */
 #define MAXPOSHEAD  1024                /* max head line position */
 #define MINFREQ_GLO -7                  /* min frequency number glonass */