diff --git a/mozilla/ef/config/NetBSD.mk b/mozilla/ef/config/NetBSD.mk
index 5d3c6277395..37ad71c3880 100644
--- a/mozilla/ef/config/NetBSD.mk
+++ b/mozilla/ef/config/NetBSD.mk
@@ -55,7 +55,9 @@ endif
 
 OS_REL_CFLAGS           = -mno-486 -Di386
 
-OS_CFLAGS		= $(DSO_CFLAGS) $(OS_REL_CFLAGS) -DNETBSD -ansi -Wall -pipe -DHAVE_STRERROR -DHAVE_BSD_FLOCK
+OS_CFLAGS               = -DGLOBALS_NEED_UNDERSCORE
+
+OS_CFLAGS		+= $(DSO_CFLAGS) $(OS_REL_CFLAGS) -DNETBSD -ansi -Wall -pipe -DHAVE_STRERROR -DHAVE_BSD_FLOCK
 OS_CXXFLAGS		= $(OS_CFLAGS)
 OS_ASFLAGS		= -DNETBSD
 OS_LDFLAGS		=