diff --git a/include/makedue.mak b/include/makedue.mak
index 71f401143..b6ae41f1d 100755
--- a/include/makedue.mak
+++ b/include/makedue.mak
@@ -98,7 +98,7 @@ $(LIB)(stack.o):  stack.cpp $(I21)
 
 $(LIB)(stdtypes.o):  stdtypes.cpp  $(I5) $(I15) $(I3) $(I8) $(I44) $(I6) $(I12) $(I30) $(S1) 
 
-$(LIB)(strings.o):  strings.cpp $(I10) $(I31) 
+$(LIB)(strings.o):  strings.cpp $(I10) $(I24) $(I31) 
 
 $(LIB)(tabutil.o):  tabutil.cpp $(I6) $(I42) $(I5) $(I31)