diff --git a/.changesets/cmake-path-patch.md b/.changesets/cmake-path-patch.md
new file mode 100644
index 000000000..5898bde0b
--- /dev/null
+++ b/.changesets/cmake-path-patch.md
@@ -0,0 +1,4 @@
+release: patch
+summary: Make variable _stm32_arm_gcc_realpath case insensitive
+
+In some systems, by default, the installation directory name is in lowercase. Making it case insensitive, only the version matters.
diff --git a/toolchains/stm32.cmake b/toolchains/stm32.cmake
index ceb0c22be..f157f2717 100644
--- a/toolchains/stm32.cmake
+++ b/toolchains/stm32.cmake
@@ -73,7 +73,8 @@ if(NOT STM32_CLT_ROOT)
     endif()
 
     get_filename_component(_stm32_arm_gcc_realpath "${_stm32_arm_gcc}" REALPATH)
-    string(REGEX MATCH "STM32CubeCLT[_-]([0-9]+\\.[0-9]+\\.[0-9]+)" _stm32_path_match "${_stm32_arm_gcc_realpath}")
+    string(TOLOWER "${_stm32_arm_gcc_realpath}" _stm32_arm_gcc_lower)
+    string(REGEX MATCH "stm32cubeclt[_-]([0-9]+\\.[0-9]+\\.[0-9]+)" _stm32_path_match "${_stm32_arm_gcc_lower}")
 
     if(NOT CMAKE_MATCH_1)
         message(FATAL_ERROR