diff --git a/fsw/cfe-core/ut-stubs/ut_es_stubs.c b/fsw/cfe-core/ut-stubs/ut_es_stubs.c
index 9a77c3d5b..e149549b8 100644
--- a/fsw/cfe-core/ut-stubs/ut_es_stubs.c
+++ b/fsw/cfe-core/ut-stubs/ut_es_stubs.c
@@ -333,6 +333,7 @@ int32 CFE_ES_RegisterChildTask(void)
 int32 CFE_ES_WriteToSysLog(const char *pSpecString, ...)
 {
     int32   status;
+    UT_Stub_RegisterContext(UT_KEY(CFE_ES_WriteToSysLog), pSpecString); // allow this input to be used by hook functions
 
     status = UT_DEFAULT_IMPL(CFE_ES_WriteToSysLog);
 
diff --git a/fsw/cfe-core/ut-stubs/ut_evs_stubs.c b/fsw/cfe-core/ut-stubs/ut_evs_stubs.c
index 306712dcf..98f0ec91c 100644
--- a/fsw/cfe-core/ut-stubs/ut_evs_stubs.c
+++ b/fsw/cfe-core/ut-stubs/ut_evs_stubs.c
@@ -111,6 +111,8 @@ int32 CFE_EVS_SendEvent(uint16 EventID,
     int32 status;
 
     UT_Stub_RegisterContext(UT_KEY(CFE_EVS_SendEvent), &EventID);
+    UT_Stub_RegisterContext(UT_KEY(CFE_EVS_SendEvent), &EventType);
+    UT_Stub_RegisterContext(UT_KEY(CFE_EVS_SendEvent), Spec);
     status = UT_DEFAULT_IMPL(CFE_EVS_SendEvent);
 
     if (status >= 0)