diff --git a/config/hal.c b/config/hal.c
index 6bb449d5a..4427deb39 100644
--- a/config/hal.c
+++ b/config/hal.c
@@ -134,10 +134,11 @@ get_prop_string_array(LibHalContext *hal_ctx, const char *udi, const char *prop)
 
         str = ret;
         for (i = 0; props[i]; i++) {
-            str = strcpy(str, props[i]);
+            strcpy(str, props[i]);
+            str += strlen(props[i]);
             *str++ = ',';
         }
-        *str = '\0';
+        *(str-1) = '\0';
 
         libhal_free_string_array(props);
     }