diff --git a/src/gnatcoll_python.gpr.in b/src/gnatcoll_python.gpr.in
index 8464858..f22df27 100644
--- a/src/gnatcoll_python.gpr.in
+++ b/src/gnatcoll_python.gpr.in
@@ -16,7 +16,7 @@ project GnatColl_Python is
    case GnatColl_Shared.Python is
       when "yes" =>
          for Languages use ("Ada", "C");
-         for Source_Dirs use Project'Source_Dirs & ("python");
+         for Source_Dirs use ("python");
          for Library_Options use (@PYTHON_LIBS_GPR@);
       when "no"  =>
          for Languages use ("Ada");
diff --git a/src/gnatcoll_python.gpr.in b/src/gnatcoll_python.gpr.in
index f22df27..d160fb4 100644
--- a/src/gnatcoll_python.gpr.in
+++ b/src/gnatcoll_python.gpr.in
@@ -20,7 +20,7 @@ project GnatColl_Python is
          for Library_Options use (@PYTHON_LIBS_GPR@);
       when "no"  =>
          for Languages use ("Ada");
-         for Source_Dirs use Project'Source_Dirs & ("nopython");
+         for Source_Dirs use ("nopython");
    end case;
 
    package Builder renames GnatColl_Shared.Builder;