diff --git a/include/arm11/hardware/timer.h b/include/arm11/hardware/timer.h
index 9e5c07c..f6fa85f 100644
--- a/include/arm11/hardware/timer.h
+++ b/include/arm11/hardware/timer.h
@@ -21,7 +21,7 @@
 #include "types.h"
 
 
-#define TIMER_BASE_FREQ    (268111856.0)
+#define TIMER_BASE_FREQ    (268111856.f)
 
 #define TIMER_ENABLE       (1u)
 #define TIMER_SINGLE_SHOT  (0u)
@@ -75,5 +75,5 @@
 // Sleeps ms milliseconds. ms can be up to 32000.
 static inline void TIMER_sleepMs(u32 ms)
 {
-	TIMER_sleepTicks(TIMER_FREQ(1, 1000.0) * ms);
+	TIMER_sleepTicks(TIMER_FREQ(1, 1000) * ms);
 }
diff --git a/include/arm9/hardware/timer.h b/include/arm9/hardware/timer.h
index fbb32ef..052524e 100644
--- a/include/arm9/hardware/timer.h
+++ b/include/arm9/hardware/timer.h
@@ -21,17 +21,17 @@
 #include "types.h"
 
 
-#define TIMER_BASE_FREQ     (67027963.95)
+#define TIMER_BASE_FREQ     (67027964)
 
 #define TIMER_COUNT_UP      (1u<<2) // For cascading at least 2 timers
 #define TIMER_IRQ_ENABLE    (1u<<6)
 #define TIMER_ENABLE        (1u<<7)
 
 // Convenience macros for calculating the ticks. Based on libnds
-#define TIMER_FREQ(n)       (0x10000u - (u16)(TIMER_BASE_FREQ / (n)))
-#define TIMER_FREQ_64(n)    (0x10000u - (u16)(TIMER_BASE_FREQ / 64.0 / (n)))
-#define TIMER_FREQ_256(n)   (0x10000u - (u16)(TIMER_BASE_FREQ / 256.0 / (n)))
-#define TIMER_FREQ_1024(n)  (0x10000u - (u16)(TIMER_BASE_FREQ / 1024.0 / (n)))
+#define TIMER_FREQ(n)       (-TIMER_BASE_FREQ / (n))
+#define TIMER_FREQ_64(n)    (-(TIMER_BASE_FREQ / 64) / (n))
+#define TIMER_FREQ_256(n)   (-(TIMER_BASE_FREQ / 256) / (n))
+#define TIMER_FREQ_1024(n)  (-(TIMER_BASE_FREQ / 1024) / (n))
 
 
 typedef enum
diff --git a/source/arm9/hardware/timer.c b/source/arm9/hardware/timer.c
index 1c9991c..27db804 100644
--- a/source/arm9/hardware/timer.c
+++ b/source/arm9/hardware/timer.c
@@ -77,7 +77,7 @@
 
 void TIMER_sleep(u32 ms)
 {
-	REG_TIMER3_VAL = TIMER_FREQ_1024(1000.0);
+	REG_TIMER3_VAL = TIMER_FREQ_1024(1000);
 	overflows = ms;
 
 	REG_TIMER3_CNT = TIMER_ENABLE | TIMER_IRQ_ENABLE | TIMER_PRESCALER_1024;