diff --git a/assign/GNUmakefile.in b/assign/GNUmakefile.in
index a935d42abd2be875a61b45af269a2b0fd22d61fe..0b1972aec376220e663db5b33924b3a922f9302b 100644
--- a/assign/GNUmakefile.in
+++ b/assign/GNUmakefile.in
@@ -41,7 +41,7 @@ OBJS += parse_ptop_xml.o parse_vtop_xml.o parse_policy_xml.o parse_error_handler
 endif
 
 # Pick either this
-CXXFLAGS += -O3 
+CXXFLAGS += -O3
 # or this
 #CXXFLAGS += -O0 -g -Wall -DVERBOSE
 # and then zero or more of these