diff --git a/make/debugger.mk b/make/debugger.mk
index 5fcb8bae..40e64b5a 100644
--- a/make/debugger.mk
+++ b/make/debugger.mk
@@ -4,7 +4,7 @@ ifeq ($(CORE_DUMPER),)
 CORE_DUMPER        = $(EXE_PATH)
 endif
 
-PID = $(shell ps aux | $(SED) "/$(notdir $(EXE_PATH))/ !d; /sed/ d" | awk '{print $$2}')
+PID = $(shell ps aux | $(SED) "/$(notdir $(EXE_PATH))/ !d; /sed/ d; /defunct/ d" | awk '{print $$2}')
 
 all: