diff --git a/stat/dw_rand_gsl.c b/stat/dw_rand_gsl.c
index b1bf4570f73762e7f42bd6ff0e60f7ed07c2dd15..c0168fdc18d646190af39312dc0267890fb3f3f8 100644
--- a/stat/dw_rand_gsl.c
+++ b/stat/dw_rand_gsl.c
@@ -299,7 +299,7 @@ PRECISION dw_binomial_cdf(int x, PRECISION q, int n)
 /*
    Returns the integer x such that dw_binominal_cdf(x,p,n) is closest to p.
 */
-int dw_binominal_invcdf(PRECISION p, PRECISION q, int n)
+int dw_binominal_invcdf(PRECISION p, __attribute__ ((unused)) PRECISION q, int n)
 {
   int min=0, max=n, mid=n/2;
   PRECISION pmin=0.0, pmax=1.0, pmid=dw_binomial_cdf(mid,p,n);