diff --git a/test/Makefile.os2 b/test/Makefile.os2
index ee66409b0..0d5198eb5 100644
--- a/test/Makefile.os2
+++ b/test/Makefile.os2
@@ -9,6 +9,7 @@ INCPATH = -I"$(%WATCOM)/h/os2" -I"$(%WATCOM)/h"
 
 CFLAGS = -bt=os2 -d0 -q -bm -5s -fp5 -fpi87 -sg -oteanbmier -ei
 CFLAGS+= -wx -wcd=303
+CFLAGS+= -DHAVE_SIGNAL_H
 !ifeq ENABLE_WERROR 1
 CFLAGS+= -we
 !endif
diff --git a/test/Makefile.w32 b/test/Makefile.w32
index 02e68e865..63613e290 100644
--- a/test/Makefile.w32
+++ b/test/Makefile.w32
@@ -13,7 +13,7 @@ CFLAGS+= -wx -wcd=303
 CFLAGS+= -we
 !endif
 CFLAGS+= -DSDL_MAIN_HANDLED
-CFLAGS+= -DHAVE_OPENGL
+CFLAGS+= -DHAVE_OPENGL -DHAVE_SIGNAL_H
 GLLIBS = opengl32.lib
 
 TNSRCS = testnative.c testnativew32.c