How to compile in -std=c99 in Geany

Question

I am coding up some .c files using Geany, and I am interested in compiling using the c99 standard.

I see that I can set build commands and I assume this is where I need to be, but I can't seem to get the syntax correct. Here are commands that I've tried in the Compile tab, but none seem to work;

gcc -std=c99  -Wall -c "%f"
gcc -Wall -c -std=c99 "%f"
gcc -Wall -std=c99 -c "%f"

Any help is appreciated!