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))
 		{