diff --git a/cmake/FindGem.cmake b/cmake/FindGem.cmake
index 612268decb..5de3c51abc 100644
--- a/cmake/FindGem.cmake
+++ b/cmake/FindGem.cmake
@@ -9,7 +9,7 @@
 set(FINDGEM_MODULES_DIR ${CMAKE_CURRENT_LIST_DIR})
 
 function(find_gem GEM_NAME)
-    set(GEM_PACKAGE "Gem:${GEM_NAME}")
+    set(GEM_PACKAGE "Gem_${GEM_NAME}")
 
     configure_file(${FINDGEM_MODULES_DIR}/FindGem.cmake.in Find${GEM_PACKAGE}.cmake @ONLY)
 
diff --git a/src/tests/CMakeLists.txt b/src/tests/CMakeLists.txt
index 949fd52b3f..20b682fe0d 100644
--- a/src/tests/CMakeLists.txt
+++ b/src/tests/CMakeLists.txt
@@ -70,10 +70,10 @@ LINK_LIBRARIES dolphinprivate dolphinstatic Qt6::Test)
 ecm_add_test(draganddrophelpertest.cpp LINK_LIBRARIES dolphinprivate Qt6::Test)
 
 find_gem(test-unit)
-set_package_properties(Gem:test-unit PROPERTIES
+set_package_properties(Gem_test-unit PROPERTIES
     TYPE RECOMMENDED
     DESCRIPTION "Ruby gem 'test-unit' required for testing of servicemenu helpers.")
-if (Gem:test-unit_FOUND)
+if (Gem_test-unit_FOUND)
     add_test(NAME servicemenutest
     COMMAND ${CMAKE_CURRENT_SOURCE_DIR}/../settings/contextmenu/test/test_run.rb)
 endif()