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-rw-r--r--stdlib/tst-strtod-round.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/stdlib/tst-strtod-round.c b/stdlib/tst-strtod-round.c
index f334b20af8..cbde457451 100644
--- a/stdlib/tst-strtod-round.c
+++ b/stdlib/tst-strtod-round.c
@@ -17,6 +17,9 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
+/* Defining _LIBC_TEST ensures long double math functions are
+   declared in the headers.  */
+#define _LIBC_TEST 1
 #include <fenv.h>
 #include <float.h>
 #include <math.h>