diff --git a/cv1/program.c b/cv1/program.c
index be31ec9..69dddbf 100644
--- a/cv1/program.c
+++ b/cv1/program.c
@@ -54,7 +54,12 @@ int read_pizza(struct pizza *item) {
         return 0;
     }
 
-    item->price = strtof(line, NULL);
+    char *endptr;
+    item->price = strtof(line, &endptr);
+    if (endptr == line || *endptr != '\n') {
+        return 0;
+    }
+
     return 1;
 }