1 files changed, 6 insertions, 3 deletions

diff --git a/src/rand.c b/src/rand.c
index 1a6a3d4..75722ac 100644
--- a/src/rand.c
+++ b/src/rand.c
@@ -9,12 +9,15 @@ unsigned long int rand_seed() {
 	return seed;
 }
 
-double rand_dist_pow(const gsl_rng *r, double beta) {
-	double x = 0;
+long double rand_dist_pow(const gsl_rng *r, double beta) {
+	long double x = 0;
 
 	// underflow means that for very small beta x is sometimes identically zero,
 	// which causes problems
-	while ((x = exp(log(gsl_rng_uniform_pos(r)) / beta)) == 0.0);
+	while (x == 0.0) {
+		long double y = logl(gsl_rng_uniform_pos(r)) / beta;
+		x = expl(y);
+	}
 
 	return x;
 }