diff --git a/newlib/libc/stdio/nano-vfscanf_float.c b/newlib/libc/stdio/nano-vfscanf_float.c
index a81fe7f70..5df9f227c 100644
--- a/newlib/libc/stdio/nano-vfscanf_float.c
+++ b/newlib/libc/stdio/nano-vfscanf_float.c
@@ -330,7 +330,7 @@ fskip:
 	{
 	  flp = GET_ARG (N, *ap, float *);
 	  if (isnan (fp))
-	    *flp = nanf (NULL);
+	    *flp = nanf ("");
 	  else
 	    *flp = fp;
 	}
diff --git a/newlib/libc/stdio/vfscanf.c b/newlib/libc/stdio/vfscanf.c
index 080dcf400..9c38eebf4 100644
--- a/newlib/libc/stdio/vfscanf.c
+++ b/newlib/libc/stdio/vfscanf.c
@@ -1886,7 +1886,7 @@ __SVFSCANF_R (struct _reent *rptr,
 		{
 		  flp = GET_ARG (N, ap, float *);
 		  if (isnan (res))
-		    *flp = nanf (NULL);
+		    *flp = nanf ("");
 		  else
 		    *flp = res;
 		}
diff --git a/newlib/libc/stdio/vfwscanf.c b/newlib/libc/stdio/vfwscanf.c
index c3470a15c..0464b0837 100644
--- a/newlib/libc/stdio/vfwscanf.c
+++ b/newlib/libc/stdio/vfwscanf.c
@@ -1636,7 +1636,7 @@ __SVFWSCANF_R (struct _reent *rptr,
 		{
 		  flp = GET_ARG (N, ap, float *);
 		  if (isnan (res))
-		    *flp = nanf (NULL);
+		    *flp = nanf ("");
 		  else
 		    *flp = res;
 		}
diff --git a/newlib/libc/stdlib/strtod.c b/newlib/libc/stdlib/strtod.c
index 431d3ab07..2a76b10ce 100644
--- a/newlib/libc/stdlib/strtod.c
+++ b/newlib/libc/stdlib/strtod.c
@@ -1289,7 +1289,7 @@ strtof_l (const char *__restrict s00, char **__restrict se, locale_t loc)
 {
   double val = _strtod_l (_REENT, s00, se, loc);
   if (isnan (val))
-    return signbit (val) ? -nanf (NULL) : nanf (NULL);
+    return signbit (val) ? -nanf ("") : nanf ("");
   float retval = (float) val;
 #ifndef NO_ERRNO
   if (isinf (retval) && !isinf (val))
@@ -1304,7 +1304,7 @@ strtof (const char *__restrict s00,
 {
   double val = _strtod_l (_REENT, s00, se, __get_current_locale ());
   if (isnan (val))
-    return signbit (val) ? -nanf (NULL) : nanf (NULL);
+    return signbit (val) ? -nanf ("") : nanf ("");
   float retval = (float) val;
 #ifndef NO_ERRNO
   if (isinf (retval) && !isinf (val))
diff --git a/newlib/libc/stdlib/wcstod.c b/newlib/libc/stdlib/wcstod.c
index 9e0d563ef..810c5b3fd 100644
--- a/newlib/libc/stdlib/wcstod.c
+++ b/newlib/libc/stdlib/wcstod.c
@@ -228,7 +228,7 @@ _wcstof_r (struct _reent *ptr,
 {
   double retval = _wcstod_l (ptr, nptr, endptr, __get_current_locale ());
   if (isnan (retval))
-    return nanf (NULL);
+    return nanf ("");
   return (float)retval;
 }
 
@@ -253,7 +253,7 @@ wcstof_l (const wchar_t *__restrict nptr, wchar_t **__restrict endptr,
 {
   double val = _wcstod_l (_REENT, nptr, endptr, loc);
   if (isnan (val))
-    return nanf (NULL);
+    return nanf ("");
   float retval = (float) val;
 #ifndef NO_ERRNO
   if (isinf (retval) && !isinf (val))
@@ -268,7 +268,7 @@ wcstof (const wchar_t *__restrict nptr,
 {
   double val = _wcstod_l (_REENT, nptr, endptr, __get_current_locale ());
   if (isnan (val))
-    return nanf (NULL);
+    return nanf ("");
   float retval = (float) val;
 #ifndef NO_ERRNO
   if (isinf (retval) && !isinf (val))