compiling assembly in linux with nasm

So I started messing around with assembly but I am having some issues compiling.

From the directions on one page I followed i did

Code:

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nasm -f elf program1.asm
ls program1.o -o program1

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But then I got this error message

Code:

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ld: i386 architecture of input file `program1.o' is incompatible with i386:x86-64 output

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So I looked up the error and there wasnt a clear answer, but it seems the linker is trying to do 64 bit and nasm is doing 32bit? Am I on the right track?

If your version of NASM is 2.00 or greater, try using "-f elf64" instead of "-f elf"