diff --git a/unicode/xmlada_unicode.gpr b/unicode/xmlada_unicode.gpr
index 8a5a2ac..290cfe6 100644
--- a/unicode/xmlada_unicode.gpr
+++ b/unicode/xmlada_unicode.gpr
@@ -37,4 +37,8 @@ project XmlAda_Unicode is
    package Binder   renames Shared.Binder;
    package Ide      renames Shared.Ide;
 
+   package Install is
+       for Sources_Subdir use "./include/xmlada/" & Project'Library_Name;
+   end Install;
+
 end XmlAda_Unicode;
diff --git a/dom/xmlada_dom.gpr b/dom/xmlada_dom.gpr
index 5c156ab..f6d37f6 100644
--- a/dom/xmlada_dom.gpr
+++ b/dom/xmlada_dom.gpr
@@ -39,4 +39,7 @@ project XmlAda_Dom is
    package Binder   renames Shared.Binder;
    package Ide      renames Shared.Ide;
 
+   package Install is
+       for Sources_Subdir use "./include/xmlada/" & Project'Library_Name;
+   end Install;
 end XmlAda_Dom;
diff --git a/input_sources/xmlada_input.gpr b/input_sources/xmlada_input.gpr
index 7602590..329bdad 100644
--- a/input_sources/xmlada_input.gpr
+++ b/input_sources/xmlada_input.gpr
@@ -39,6 +39,7 @@ project XmlAda_Input is
    package Ide      renames Shared.Ide;
 
    package Install is
+      for Sources_Subdir use "./include/xmlada/" & Project'Library_Name;
       for Artifacts ("share/doc/xmlada")
         use ("../docs/_build/html/*", "../docs/_build/latex/XMLAda.pdf");
       for Artifacts ("lib/gnat") use ("../distrib/xmlada.gpr");
diff --git a/sax/xmlada_sax.gpr b/sax/xmlada_sax.gpr
index f4d74ac..c146d79 100644
--- a/sax/xmlada_sax.gpr
+++ b/sax/xmlada_sax.gpr
@@ -39,4 +39,8 @@ project XmlAda_Sax is
    package Binder   renames Shared.Binder;
    package Ide      renames Shared.Ide;
 
+   package Install is
+       for Sources_Subdir use "./include/xmlada/" & Project'Library_Name;
+   end Install;
+
 end XmlAda_Sax;
diff --git a/schema/xmlada_schema.gpr b/schema/xmlada_schema.gpr
index 4688847..62dee2f 100644
--- a/schema/xmlada_schema.gpr
+++ b/schema/xmlada_schema.gpr
@@ -40,4 +40,8 @@ project XmlAda_Schema is
    package Binder   renames Shared.Binder;
    package Ide      renames Shared.Ide;
 
+   package Install is
+       for Sources_Subdir use "./include/xmlada/" & Project'Library_Name;
+   end Install;
+
 end XmlAda_Schema;