Include `math.h` where necessary. (#25122)

1 files changed, 1 insertions, 0 deletions

diff --git a/keyboards/rubi/lib/calc.c b/keyboards/rubi/lib/calc.c
index 7796a9be45..b289fdb54b 100644
--- a/keyboards/rubi/lib/calc.c
+++ b/keyboards/rubi/lib/calc.c
@@ -13,6 +13,7 @@ This is the modified version of [calculator by MWWorks](https://github.com/MWWor
    Feel free to fix it! I think it needs to detect the precision of the two operands and then figure out what the precision of the result should be
 
 */
+#include <math.h>
 #include "rubi.h"
 
 static uint8_t calc_current_operand = 0;