diff --git a/rules/pulpos/default_rules.mk b/rules/pulpos/default_rules.mk
index 52ee68e..6bbf872 100644
--- a/rules/pulpos/default_rules.mk
+++ b/rules/pulpos/default_rules.mk
@@ -12,6 +12,8 @@ else
 ifdef PULP_RISCV_GCC_TOOLCHAIN
 PULP_CC := $(PULP_RISCV_GCC_TOOLCHAIN)/bin/$(PULP_CC)
 else
+$(warning "Warning: Neither PULP_RUNTIME_GCC_TOOLCHAIN nor PULP_RISCV_GCC_TOOLCHAIN is set.\
+Using defaults.")
 endif
 endif
 
@@ -230,4 +232,4 @@ size:
 help:
 	@echo "Makefile options:"
 	@echo "  CONFIG_TRACE_LEVEL=<level>    Activate traces for the specified level (0=none, 1=fatal, 2=error, 3=warning, 4=info, 5=debug, 6=trace)."
-	@echo "  CONFIG_TRACE_ALL=1            Activate all traces. Other traces can be individually activated with CONFIG_TRACE_<NAME>."
\ No newline at end of file
+	@echo "  CONFIG_TRACE_ALL=1            Activate all traces. Other traces can be individually activated with CONFIG_TRACE_<NAME>."