diff --git a/lib/stdio/vfprintf.c b/lib/stdio/vfprintf.c
index 9de972ad..979ad8df 100644
--- a/lib/stdio/vfprintf.c
+++ b/lib/stdio/vfprintf.c
@@ -204,7 +204,7 @@ vfprintf (FILE * f, char const *format, va_list ap)
                     }
                   while (precision > length)
                     {
-                      fputc ('0', f);
+                      fputc (' ', f);
                       precision--;
                       width--;
                       count++;
diff --git a/lib/stdio/vsnprintf.c b/lib/stdio/vsnprintf.c
index 8b99ff58..a8d9624d 100644
--- a/lib/stdio/vsnprintf.c
+++ b/lib/stdio/vsnprintf.c
@@ -222,7 +222,7 @@ vsnprintf (char *str, size_t size, char const *format, va_list ap)
                   while (precision > length)
                     {
                       if (count < size)
-                        *str++ = '0';
+                        *str++ = ' ';
                       precision--;
                       width--;
                       count++;
diff --git a/lib/tests/stdio/90-sprintf.c b/lib/tests/stdio/90-sprintf.c
index 2401195d..cbbd8918 100644
--- a/lib/tests/stdio/90-sprintf.c
+++ b/lib/tests/stdio/90-sprintf.c
@@ -18,7 +18,7 @@
  * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include <libmes.h>
+#include <mes/lib.h>
 #include <stdio.h>
 #include <stdlib.h>
 
@@ -26,8 +26,18 @@ int
 main ()
 {
   char buf[20];
-  double d = 0;
-  sprintf (buf, "%.6g", d);
+
+  int i = 0;
+  printf ("%3.6d\n", i);
+  sprintf (buf, "%3.6d", i);
+  puts (buf);
+
+  double d = 1;
+  printf ("%3.6f\n", d);
+  sprintf (buf, "%3.6f", d);
+  puts (buf);
+  printf ("%3.6g\n", d);
+  sprintf (buf, "%3.6g", d);
   puts (buf);
 
   return 0;
diff --git a/lib/tests/stdio/90-sprintf.stdout b/lib/tests/stdio/90-sprintf.stdout
index 573541ac..ff6ae31d 100644
--- a/lib/tests/stdio/90-sprintf.stdout
+++ b/lib/tests/stdio/90-sprintf.stdout
@@ -1 +1,6 @@
-0
+000000
+000000
+1.000000
+1.000000
+  1
+  1