diff --git a/arm9/asm/MSL_DPMath_s_ldexp.s b/arm9/asm/MSL_DPMath_s_ldexp.s
index 509b1774a..349b154af 100644
--- a/arm9/asm/MSL_DPMath_s_ldexp.s
+++ b/arm9/asm/MSL_DPMath_s_ldexp.s
@@ -10,7 +10,7 @@ ldexp: ; 0x020E8318
 	ldr r0, [sp, #0x8]
 	ldr r1, [sp, #0xc]
 	mov r4, r2
-	bl __fpclassifyf
+	bl __fpclassifyd
 	cmp r0, #0x2
 	ble _020E8350
 	mov r0, #0x0
diff --git a/arm9/asm/MSL_fp_ansi.s b/arm9/asm/MSL_fp_ansi.s
index 90af17c1c..285a34fec 100644
--- a/arm9/asm/MSL_fp_ansi.s
+++ b/arm9/asm/MSL_fp_ansi.s
@@ -1020,7 +1020,7 @@ __num2dec_internal: ; 0x020E9140
 	mov r7, r0
 	mov r0, r8
 	mov r1, r6
-	bl __signbitf
+	bl __signbitd
 	cmp r0, #0x0
 	movne r1, #0x1
 	moveq r1, #0x0
@@ -1043,7 +1043,7 @@ __num2dec_internal: ; 0x020E9140
 _020E91AC:
 	mov r0, r8
 	mov r1, r6
-	bl __fpclassifyf
+	bl __fpclassifyd
 	cmp r0, #0x2
 	bgt _020E91F8
 	strb r5, [r7, #0x0]
@@ -1053,7 +1053,7 @@ _020E91AC:
 	mov r0, r8
 	mov r1, r6
 	strb r2, [r7, #0x4]
-	bl __fpclassifyf
+	bl __fpclassifyd
 	cmp r0, #0x1
 	moveq r0, #0x4e
 	movne r0, #0x49
@@ -1389,7 +1389,7 @@ _020E968C:
 	bl ldexp
 	str r0, [sp, #0x8]
 	str r1, [sp, #0xc]
-	bl __fpclassifyf
+	bl __fpclassifyd
 	cmp r0, #0x2
 	bne _020E96C0
 	ldr r0, _020E9988 ; =0x7FEFFFFF
@@ -1427,7 +1427,7 @@ _020E971C:
 	adds r0, r0, #0x1
 	adc r1, r1, #0x0
 	stmia r4, {r0-r1}
-	bl __fpclassifyf
+	bl __fpclassifyd
 	cmp r0, #0x2
 	beq _020E9934
 	b _020E975C
diff --git a/arm9/asm/MSL_math.s b/arm9/asm/MSL_math.s
index 718ea9376..1ceae83a7 100644
--- a/arm9/asm/MSL_math.s
+++ b/arm9/asm/MSL_math.s
@@ -45,17 +45,17 @@ _020E9A18: .word 0x33333333
 _020E9A1C: .word 0x0F0F0F0F
 	arm_func_end __msl_generic_count_bits64
 
-	arm_func_start __signbitf
-__signbitf:
+	arm_func_start __signbitd
+__signbitd:
 	stmdb sp!, {r0-r3}
 	ldr r0, [sp, #0x4]
 	and r0, r0, #0x80000000
 	add sp, sp, #0x10
 	bx lr
-	arm_func_end __signbitf
+	arm_func_end __signbitd
 
-	arm_func_start __fpclassifyf
-__fpclassifyf: ; 0x020E9A34
+	arm_func_start __fpclassifyd
+__fpclassifyd: ; 0x020E9A34
 	stmdb sp!, {r0-r3}
 	ldr r2, [sp, #0x4]
 	ldr r0, _020E9A9C ; =0x7FF00000
@@ -87,7 +87,7 @@ _020E9A90:
 	.balign 4
 _020E9A9C: .word 0x7FF00000
 _020E9AA0: .word 0x000FFFFF
-	arm_func_end __fpclassifyf
+	arm_func_end __fpclassifyd
 
 	arm_func_start scalbn
 scalbn: ; 0x020E9AA4
diff --git a/arm9/global.inc b/arm9/global.inc
index f370620e1..ab48a651d 100644
--- a/arm9/global.inc
+++ b/arm9/global.inc
@@ -9342,12 +9342,12 @@
 .extern __float_nan
 .extern __flush_all
 .extern __flush_buffer
-.extern __fpclassifyf
+.extern __fpclassifyd
 .extern __memrchr
 .extern __msl_digit
 .extern __msl_generic_count_bits64
 .extern __prep_buffer
-.extern __signbitf
+.extern __signbitd
 .extern __stdio_exit
 .extern __wctype_mapC
 .extern copysign