diff --git a/libimagdiary/Cargo.toml b/libimagdiary/Cargo.toml
index 45bbbf4b..afb9fadd 100644
--- a/libimagdiary/Cargo.toml
+++ b/libimagdiary/Cargo.toml
@@ -13,6 +13,9 @@ documentation = "https://matthiasbeyer.github.io/imag/imag_documentation/index.h
 repository    = "https://github.com/matthiasbeyer/imag"
 homepage      = "http://imag-pim.org"
 
+[profile.dev]
+codegen-units = 2
+
 [dependencies]
 chrono = "0.2"
 log = "0.3.5"