diff --git a/mozilla/security/coreconf/WIN32.mk b/mozilla/security/coreconf/WIN32.mk
index 42347d850f7..d275300b265 100644
--- a/mozilla/security/coreconf/WIN32.mk
+++ b/mozilla/security/coreconf/WIN32.mk
@@ -136,7 +136,8 @@ else # !NS_USE_GCC
 	USERNAME   := $(subst -,_,$(USERNAME))
 	DEFINES    += -DDEBUG -D_DEBUG -UNDEBUG -DDEBUG_$(USERNAME)
 	DLLFLAGS   += -DEBUG -DEBUGTYPE:CV -OUT:"$@"
-	LDFLAGS    += -DEBUG -DEBUGTYPE:CV -PDB:NONE
+	# Purify requires /FIXED:NO when linking EXEs.
+	LDFLAGS    += -DEBUG -DEBUGTYPE:CV -PDB:NONE /FIXED:NO
     endif
 endif # NS_USE_GCC