diff --git a/examples/apps/dccp/Makefile b/examples/apps/dccp/Makefile
index 452b240e0..e0b08ec81 100644
--- a/examples/apps/dccp/Makefile
+++ b/examples/apps/dccp/Makefile
@@ -19,7 +19,7 @@ prove: $(GNATPROVE_CACHE_DIR) $(GENERATED)
 generate: $(GENERATED) $(GRAPHS)
 
 clean:
-	$(RM) generated/* obj/*
+	$(RM) -r generated/* obj/*
 
 $(GENERATED): $(SPECS) | generated
 	rflx generate -d generated $^
diff --git a/examples/apps/dhcp_client/Makefile b/examples/apps/dhcp_client/Makefile
index 9fd5ab825..aac88f6e7 100644
--- a/examples/apps/dhcp_client/Makefile
+++ b/examples/apps/dhcp_client/Makefile
@@ -22,7 +22,7 @@ prove: $(GNATPROVE_CACHE_DIR) $(GENERATED)
 generate: $(GENERATED)
 
 clean:
-	$(RM) generated/* obj/*
+	$(RM) -r generated/* obj/*
 
 $(GENERATED): $(SPECS) | generated
 	rflx generate -d generated --debug built-in $^
diff --git a/examples/apps/ping/Makefile b/examples/apps/ping/Makefile
index 70f751c49..fe25c3f7c 100644
--- a/examples/apps/ping/Makefile
+++ b/examples/apps/ping/Makefile
@@ -23,7 +23,7 @@ prove: $(GNATPROVE_CACHE_DIR) $(GENERATED)
 generate: $(GENERATED)
 
 clean:
-	$(RM) generated/* obj/* python
+	$(RM) -r generated/* obj/* python
 
 $(GENERATED): $(SPECS) | generated
 	rflx generate -d generated --ignore-unsupported-checksum $^