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-rw-r--r--src/math/acos.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/math/acos.c b/src/math/acos.c
index a610fe2e..d1933fbd 100644
--- a/src/math/acos.c
+++ b/src/math/acos.c
@@ -1,7 +1,7 @@
# define TGSOURCE "std/9899-1990/math/acos.c"
#include <math.h>
#include "errno.h"
-#include "nonstd/tgmath.h"
+#include "_tgmath.h"
/** arc cosine **/
TYPE TGFN(acos)(TYPE x)