diff --git a/.github/workflows/futs_windows.yml b/.github/workflows/futs_windows.yml
index abd1ce3..2968655 100644
--- a/.github/workflows/futs_windows.yml
+++ b/.github/workflows/futs_windows.yml
@@ -20,7 +20,7 @@ jobs:
         run: |
             choco upgrade mingw --version="'16.1.0'" -y
             choco install -y make
-            cmake -G "Unix Makefiles" -DCMAKE_Fortran_FLAGS="-fmodule-private" -Bbuild -DBUILD_TESTS=ON
+            cmake -G "Unix Makefiles" -Bbuild -DBUILD_TESTS=ON
             cmake --build build
             ./build/FortUTF_Tests.exe
 
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6ce6d65..018941a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -34,7 +34,7 @@ endif()
 
 if(BUILD_TESTS)
     if(CMAKE_Fortran_COMPILER_ID STREQUAL "GNU")
-        set(CMAKE_Fortran_FLAGS "-Wall -Wextra -Wno-compare-reals -Wno-maybe-uninitialized -Wno-uninitialized -O3 -g -fprofile-arcs -ftest-coverage")
+        set(CMAKE_Fortran_FLAGS "-Wall -Wextra -Wno-compare-reals -Wno-maybe-uninitialized -Wno-uninitialized -O3 -g -fprofile-arcs -ftest-coverage -fmodule-private")
     elseif(CMAKE_Fortran_COMPILER_ID STREQUAL "Intel")
         set(CMAKE_Fortran_FLAGS "-O3")
     endif()
diff --git a/examples/demo_project/src/demo_functions.f90 b/examples/demo_project/src/demo_functions.f90
index 5a7ad53..ea5df7f 100644
--- a/examples/demo_project/src/demo_functions.f90
+++ b/examples/demo_project/src/demo_functions.f90
@@ -1,5 +1,8 @@
 MODULE DEMO_FUNCTIONS
     IMPLICIT NONE
+    PRIVATE
+
+    PUBLIC :: DEMO_FUNC_1, DEMO_FUNC_2, DEMO_FUNC_3, DEMO_FUNC_4
 
     INTEGER, PARAMETER :: REAL_KIND_8BYTE = SELECTED_REAL_KIND(15, 307)
 
diff --git a/examples/demo_project/tests/test_functions.f90 b/examples/demo_project/tests/test_functions.f90
index 24ccd99..09c9f74 100644
--- a/examples/demo_project/tests/test_functions.f90
+++ b/examples/demo_project/tests/test_functions.f90
@@ -1,6 +1,7 @@
 MODULE TEST_DEMO_FUNCTIONS
     USE FORTUTF
     USE DEMO_FUNCTIONS
+    PUBLIC
 
     CONTAINS
     SUBROUTINE TEST_DEMO_FUNC_1
diff --git a/src/test_suite.f90 b/src/test_suite.f90
index 9f5818a..3d93254 100644
--- a/src/test_suite.f90
+++ b/src/test_suite.f90
@@ -4,4 +4,20 @@ MODULE FORTUTF
     USE FTF_STRING_CHECK
     USE FUTF_SUITE
     USE FUTF_UTILITIES
+    IMPLICIT NONE
+    PRIVATE
+
+    PUBLIC :: ASSERT_EQUAL, ASSERT_ALMOST_EQUAL, ASSERT_TRUE, ASSERT_FALSE, &
+        & ASSERT_NOT_EQUAL, ASSERT_LESS_THAN, ASSERT_LESS_THAN_EQUAL, &
+        & ASSERT_GREATER_THAN, ASSERT_GREATER_THAN_EQUAL, ASSERT_IS_INT, &
+        & ASSERT_IS_REAL, ASSERT_IS_CHARACTER, ASSERT_IS_COMPLEX, &
+        & ASSERT_ARRAY_CONTAINS, INT_KIND_1BYTE, INT_KIND_2BYTE, &
+        & INT_KIND_4BYTE, INT_KIND_8BYTE, REAL_KIND_4BYTE, REAL_KIND_8BYTE
+    PUBLIC :: FAIL, SUCCEED
+    PUBLIC :: STRING_CONTAINS, STRING_HAS_SUFFIX, STRING_HAS_PREFIX
+    PUBLIC :: FUTF_PASSED, FUTF_TOTAL, FUTF_EXIT_CODE, IDENTIFIER, TEST_NAMES, &
+        & TEST_RESULTS, INFO_STRINGS, TAG_TEST, REGISTER_PASSED, &
+        & REGISTER_FAILED, TEST_SUMMARY, FAILED_TEST_SUMMARY, &
+        & RESET_LAST_TEST_STATUS
+    PUBLIC :: APPEND_CHAR, APPEND_INT, GET_INDEX_STRARRAY
 END MODULE FORTUTF