diff --git a/support/Makefile b/support/Makefile
index 9d88d02..1e50d79 100644
--- a/support/Makefile
+++ b/support/Makefile
@@ -28,7 +28,7 @@ COBJS=cltkCaml.$(O) cltkUtf.$(O) cltkEval.$(O) cltkEvent.$(O) \
       cltkFile.$(O) cltkMain.$(O) cltkMisc.$(O) cltkTimer.$(O) \
       cltkVar.$(O) cltkWait.$(O) cltkImg.$(O)
 
-CCFLAGS=-I$(LIBDIR)/caml $(TK_DEFS) $(SHAREDCCCOMPOPTS)
+CCFLAGS=-I$(LIBDIR)/caml $(TK_DEFS) $(SHAREDCCCOMPOPTS) -g
 
 COMPFLAGS=
 THFLAGS=-I +threads -I vmthreads