diff --git a/dv/uvm/core_ibex/Makefile b/dv/uvm/core_ibex/Makefile
index 7f630522..9ce5035e 100644
--- a/dv/uvm/core_ibex/Makefile
+++ b/dv/uvm/core_ibex/Makefile
@@ -33,7 +33,7 @@ WAVES               := 1
 # Enable coverage dump
 COV                 := 0
 # Enable cosimulation flow
-COSIM               := 0
+COSIM               := 1
 # RTL simulator
 SIMULATOR           := vcs
 # ISS (spike, ovpsim)