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-rw-r--r--math/test-signgam-finite-c99.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/math/test-signgam-finite-c99.c b/math/test-signgam-finite-c99.c
index fd9cdd37dc..bd3bdca661 100644
--- a/math/test-signgam-finite-c99.c
+++ b/math/test-signgam-finite-c99.c
@@ -18,6 +18,7 @@
 
 #undef _LIBC
 #undef _GNU_SOURCE
+#undef _Mlong_double_
 #define _ISOMAC
 
 #include <math.h>