diff --git a/cmake/modules/envtoh.cmake b/cmake/modules/envtoh.cmake
index bad6c2d..822e73b 100644
--- a/cmake/modules/envtoh.cmake
+++ b/cmake/modules/envtoh.cmake
@@ -15,9 +15,11 @@ file(STRINGS "${ENV_FILE}" ENV_LINES)
 set(HEADER_CONTENT "#pragma once\n#include \"dusk.h\"\n\n")
 
 foreach(line IN LISTS ENV_LINES)
-  # Trim whitespace
-  string(REGEX REPLACE "^[ \t]*" "" line "${line}")
-  string(REGEX REPLACE "[ \t]*$" "" line "${line}")
+  # Only trim whitespace if line is not empty
+  if(NOT line STREQUAL "")
+    string(REGEX REPLACE "^[ \t]*" "" line "${line}")
+    string(REGEX REPLACE "[ \t]*$" "" line "${line}")
+  endif()
 
   # Skip comments and empty lines (allow whitespace before # or ;)
   if(line STREQUAL "" OR line MATCHES "^[ \t]*[#;]")