diff --git a/src/Makefile b/src/Makefile
index a508acf..4df30e9 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -28,7 +28,7 @@ all: $(EXEC)
 # executable compilation and link
 
 ecoPrimers: $(PRIMER_OBJ) $(LIBFILE) 
-	$(CC) -g $(LDFLAGS) -O5 -m64 -o $@ $< $(LIBPATH) $(LIB)
+	$(CC) $(LDFLAGS) -O5 -o $@ $< $(LIBPATH) $(LIB)
 	
 
 ########