diff --git a/rules/pulpos/default_rules.mk b/rules/pulpos/default_rules.mk
index 97ab7aa..52ee68e 100644
--- a/rules/pulpos/default_rules.mk
+++ b/rules/pulpos/default_rules.mk
@@ -5,6 +5,17 @@ endif
 
 platform ?= rtl
 
+
+ifdef PULP_RUNTIME_GCC_TOOLCHAIN
+PULP_CC := $(PULP_RUNTIME_GCC_TOOLCHAIN)/bin/$(PULP_CC)
+else
+ifdef PULP_RISCV_GCC_TOOLCHAIN
+PULP_CC := $(PULP_RISCV_GCC_TOOLCHAIN)/bin/$(PULP_CC)
+else
+endif
+endif
+
+
 ifdef gui
 override runner_args += --config-opt=**/vsim/gui=true
 endif