diff --git a/cocotb/share/def/.gitignore b/cocotb/share/def/.gitignore
new file mode 100644
index 0000000000..322161e38a
--- /dev/null
+++ b/cocotb/share/def/.gitignore
@@ -0,0 +1,2 @@
+# Generated import libraries on Windows
+*.a
diff --git a/cocotb/share/def/modelsim.def b/cocotb/share/def/modelsim.def
index d6dcb0534e..8674e17971 100644
--- a/cocotb/share/def/modelsim.def
+++ b/cocotb/share/def/modelsim.def
@@ -100,3 +100,16 @@ mti_TickLeft
 mti_TickLength
 mti_TickRight
 mti_VsimFree
+mti_Interp
+mti_Cmd
+Tcl_GetStringResult
+Tcl_ResetResult
+Tcl_GetObjResult
+Tcl_ResetResult
+Tcl_ListObjGetElements
+Tcl_GetStringResult
+TclFreeObj
+Tcl_ResetResult
+Tcl_ResetResult
+Tcl_GetString
+TclFreeObj