diff --git a/sysdeps/m68k/Makefile b/sysdeps/m68k/Makefile
index 3d35ac56ba..ffdc68274e 100644
--- a/sysdeps/m68k/Makefile
+++ b/sysdeps/m68k/Makefile
@@ -36,3 +36,6 @@ asm-CPPFLAGS += $(m68k-syntax-flag)
 
 # Make sure setjmp.c is compiled with a frame pointer
 CFLAGS-setjmp.c := -fno-omit-frame-pointer
+
+# The 68k `long double' is a distinct type we support.
+long-double-fcts = yes