diff --git a/grow/defs/pythag.yaml b/grow/defs/pythag.yaml
index 47c00bc..079f469 100644
--- a/grow/defs/pythag.yaml
+++ b/grow/defs/pythag.yaml
@@ -1,6 +1,6 @@
 global_memory_size: 2
 function_memory_size: 1
-instruction_limit: 20
+instruction_limit: 10
 
 instructions_per_function_mean: 5
 instructions_per_function_std_dev: 3