diff --git a/UnitTestFrameworkPkg/Library/UnitTestLib/Assert.c b/UnitTestFrameworkPkg/Library/UnitTestLib/Assert.c
index 3669d63701..9a74016456 100644
--- a/UnitTestFrameworkPkg/Library/UnitTestLib/Assert.c
+++ b/UnitTestFrameworkPkg/Library/UnitTestLib/Assert.c
@@ -42,6 +42,7 @@ AddUnitTestFailure (
 
 STATIC
 VOID
+EFIAPI
 UnitTestLogFailure (
   IN FAILURE_TYPE  FailureType,
   IN CONST CHAR8   *Format,
diff --git a/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLib.c b/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLib.c
index 66c9db457d..7f7443a233 100644
--- a/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLib.c
+++ b/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLib.c
@@ -11,6 +11,7 @@
 #include <Library/DebugLib.h>
 
 VOID
+EFIAPI
 ReportPrint (
   IN CONST CHAR8  *Format,
   ...
diff --git a/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibConOut.c b/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibConOut.c
index cfb0c5972b..db5402d6a2 100644
--- a/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibConOut.c
+++ b/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibConOut.c
@@ -12,6 +12,7 @@
 #include <Library/DebugLib.h>
 
 VOID
+EFIAPI
 ReportPrint (
   IN CONST CHAR8  *Format,
   ...
diff --git a/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibDebugLib.c b/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibDebugLib.c
index 1402d0ef83..1d62c6a371 100644
--- a/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibDebugLib.c
+++ b/UnitTestFrameworkPkg/Library/UnitTestResultReportLib/UnitTestResultReportLibDebugLib.c
@@ -11,6 +11,7 @@
 #include <Library/DebugLib.h>
 
 VOID
+EFIAPI
 ReportPrint (
   IN CONST CHAR8  *Format,
   ...