diff --git a/src/test.c b/src/test.c
index 2bcb9abc8..4f14e4080 100644
--- a/src/test.c
+++ b/src/test.c
@@ -136,7 +136,7 @@ find_int (char const *string)
   char const *p;
   char const *number_start;
 
-  for (p = string; isblank (to_uchar (*p)); p++)
+  for (p = string; isspace (to_uchar (*p)); p++)
     continue;
 
   if (*p == '+')
@@ -154,7 +154,7 @@ find_int (char const *string)
     {
       while (ISDIGIT (*p))
         p++;
-      while (isblank (to_uchar (*p)))
+      while (isspace (to_uchar (*p)))
         p++;
       if (!*p)
         return number_start;