diff --git a/src/system/libroot/posix/glibc/stdio-common/printf_fphex.c b/src/system/libroot/posix/glibc/stdio-common/printf_fphex.c
index f6dc2e7515..b68c4e85fd 100644
--- a/src/system/libroot/posix/glibc/stdio-common/printf_fphex.c
+++ b/src/system/libroot/posix/glibc/stdio-common/printf_fphex.c
@@ -253,7 +253,7 @@ __printf_fphex (FILE *fp,
       fpnum.ldbl.d = *(const long double *) args[0];

       /* Check for special values: not a number or infinity.  */
-      if (__isnanl (fpnum.ldbl.d))
+      if (isnanl (fpnum.ldbl.d))
        {
          if (isupper (info->spec))
            {
@@ -269,7 +269,7 @@ __printf_fphex (FILE *fp,
        }
       else
        {
-         if (__isinfl (fpnum.ldbl.d))
+         if (isinfl (fpnum.ldbl.d))
            {
              if (isupper (info->spec))
                {
@@ -292,7 +292,7 @@ __printf_fphex (FILE *fp,
       fpnum.dbl.d = *(const double *) args[0];

       /* Check for special values: not a number or infinity.  */
-      if (__isnan (fpnum.dbl.d))
+      if (isnan (fpnum.dbl.d))
        {
          if (isupper (info->spec))
            {
@@ -308,7 +308,7 @@ __printf_fphex (FILE *fp,
        }
       else
        {
-         if (__isinf (fpnum.dbl.d))
+         if (isinf (fpnum.dbl.d))
            {
              if (isupper (info->spec))
                {