diff --git a/Quake/in_sdl.c b/Quake/in_sdl.c
index 6ab79ee5..b63149c9 100644
--- a/Quake/in_sdl.c
+++ b/Quake/in_sdl.c
@@ -416,6 +416,11 @@ static joyaxisstate_t joy_axisstate;
 static double joy_buttontimer[SDL_CONTROLLER_BUTTON_MAX];
 static double joy_emulatedkeytimer[10];
 
+#ifdef __WATCOMC__ /* OW1.9 doesn't have powf() / sqrtf() */
+#define powf pow
+#define sqrtf sqrt
+#endif
+
 /*
 ================
 IN_AxisMagnitude