diff --git a/src/main.rs b/src/main.rs
index 65032a7..9edb07d 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -130,12 +130,11 @@ fn main() {
 
     // get config
     let mut config = Config::get_default();
-    for k in parsed_config.keys() {
-        if let Value::Table(t) = parsed_config.get(k).unwrap() {
-            if k == "config" {
-                config.set(&t);
-                break;
-            }
+    if let Some(v) = parsed_config.get("config") {
+        if let Value::Table(t) = v {
+            config.set(&t);
+        } else {
+            panic!("error parsing config table: config invalid type, must be a table.");
         }
     }
     //----
@@ -212,7 +211,7 @@ rule regen_compile_commands
 
 build $builddir: mkdir
 
-build $builddir/compile_commands.json: regen_compile_commands {config_file_name} | $builddir
+build $builddir/compile_commands.json: regen_compile_commands {config_file_name} || $builddir
   pool = console
 
 build {output_file}: regen_ninjafile {config_file_name} || $builddir/compile_commands.json