1 files changed, 1 insertions, 0 deletions
diff --git a/src/math/scalb.c b/src/math/scalb.c
index a54bdf2b..efe69e60 100644
--- a/src/math/scalb.c
+++ b/src/math/scalb.c
@@ -15,6 +15,7 @@
  * should use scalbn() instead.
  */
 
+#define _GNU_SOURCE
 #include <math.h>
 
 double scalb(double x, double fn)