diff --git a/www/judge/languages/c11.py b/www/judge/languages/c11.py
index 252b77c..037d1ae 100644
--- a/www/judge/languages/c11.py
+++ b/www/judge/languages/c11.py
@@ -13,7 +13,7 @@ def system(cmd):
 
 def setup(sandbox, source_code):
     sandbox.write_file(source_code, "submission.c")
-    compiled = sandbox.run("gcc -O3 submission.c -pedantic-errors -lm -std=c11", stdout=".stdout",
+    compiled = sandbox.run("gcc -O3 submission.c -pedantic-errors -lm -std=c11 -DNDEBUG", stdout=".stdout",
                            stderr=".stderr", time_limit=10,
                            memory_limit=COMPILE_MEMORY_LIMIT)
     if compiled.split()[0] != "OK":
diff --git a/www/judge/languages/cpp.py b/www/judge/languages/cpp.py
index 0817103..ab13dba 100644
--- a/www/judge/languages/cpp.py
+++ b/www/judge/languages/cpp.py
@@ -13,7 +13,7 @@ def system(cmd):
 
 def setup(sandbox, source_code):
     sandbox.write_file(source_code, "submission.cpp")
-    compiled = sandbox.run("g++ -O3 submission.cpp -pedantic-errors --std=c++0x", stdout=".stdout",
+    compiled = sandbox.run("g++ -O3 submission.cpp -pedantic-errors --std=c++0x -DNDEBUG", stdout=".stdout",
                            stderr=".stderr", time_limit=10,
                            memory_limit=COMPILE_MEMORY_LIMIT)
     if compiled.split()[0] != "OK":