diff --git a/aes/sim/vhdl/Makefile b/aes/sim/vhdl/Makefile
index acd0f51..78cc056 100644
--- a/aes/sim/vhdl/Makefile
+++ b/aes/sim/vhdl/Makefile
@@ -26,7 +26,7 @@ RTL_SRC := \
 
 SIM_SRC   := tb_aes.vhd
 C_SRC     := tb_aes.c
-OSVVM_SRC := ../../../lib/OSVVM
+OSVVM_SRC := ../../../lib/osvvm
 VHD_STD   := 08