diff --git a/external/gsl/CMakeLists.txt b/external/gsl/CMakeLists.txt
index d053a80..b03be4f 100644
--- a/external/gsl/CMakeLists.txt
+++ b/external/gsl/CMakeLists.txt
@@ -19,7 +19,7 @@ if (DESKTOP_APP_USE_PACKAGED)
     endif()
 endif()
 
-if(NOT Microsoft.GSL_FOUND)
+if (NOT Microsoft.GSL_FOUND)
     target_include_directories(external_gsl SYSTEM
     INTERFACE
         ${third_party_loc}/GSL/include