diff --git a/CMakeLists.txt b/CMakeLists.txt
index b62298b..57d0fd4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -19,7 +19,7 @@ set(CMAKE_MODULE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/cmake ${CMAKE_MODULE_PATH})
 include(helpers)
 
 set(project_version "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")
-if(NOT DEFINED PROJECT_VERSION_TWEAK)
+if(PROJECT_VERSION_TWEAK STREQUAL "")
 	set(project_version "${project_version}")
 elseif(PROJECT_VERSION_TWEAK EQUAL 0)
 	set(project_version "${project_version}-dev")
diff --git a/install/CMakeLists.txt b/install/CMakeLists.txt
index ec31af9..da3e221 100644
--- a/install/CMakeLists.txt
+++ b/install/CMakeLists.txt
@@ -61,7 +61,7 @@ set(CPACK_PACKAGE_NAME zenohcpp)
 
 if(NOT CPACK_PACKAGE_VERSION)
     set(SEM_VER "${PROJECT_VERSION_MAJOR}.${PROJECT_VERSION_MINOR}.${PROJECT_VERSION_PATCH}")
-    if(NOT DEFINED PROJECT_VERSION_TWEAK)
+    if(PROJECT_VERSION_TWEAK STREQUAL "")
         set(CPACK_PACKAGE_VERSION ${SEM_VER})
     elseif(PROJECT_VERSION_TWEAK EQUAL 0)
         set(CPACK_PACKAGE_VERSION "${SEM_VER}~dev-1")