diff --git a/thesis.tex b/thesis.tex
index a54a0a7..fdbb5b5 100644
--- a/thesis.tex
+++ b/thesis.tex
@@ -53,7 +53,7 @@
 %%
 %% Theorem environments
 %%
-\newtheorem{theorem}{Theorem}[section]
+\newtheorem{theorem}{Theorem}[chapter]
 \newtheorem{lemma}[theorem]{Lemma}
 \newtheorem{proposition}[theorem]{Proposition}
 \newtheorem{corollary}[theorem]{Corollary}