--- a/tests/Makefile
+++ b/tests/Makefile
@@ -67,7 +67,7 @@
 CPLIB	= $(VCLIB)
 CPDLL	= $(VCDLL)
 
-CFLAGS= $(OPTIM) /W3 /WX /MD /nologo /Yd /Zi
+CFLAGS= $(OPTIM) /W3 /WX /MD /nologo /Zi
 LFLAGS= /INCREMENTAL:NO
 INCLUDES=-I.
 BUILD_DIR=..