diff --git a/src/lj_vm.h b/src/lj_vm.h
index 2cf04184..a13a8ce0 100644
--- a/src/lj_vm.h
+++ b/src/lj_vm.h
@@ -49,9 +49,9 @@ LJ_ASMF void lj_vm_exit_handler(void);
 LJ_ASMF void lj_vm_exit_interp(void);
 
 /* Internal math helper functions. */
-#if LJ_TARGET_X86ORX64
-#define lj_vm_floor(x)	floor(x)
-#define lj_vm_ceil(x)	ceil(x)
+#if LJ_TARGET_X86ORX64 || LJ_TARGET_PPC
+#define lj_vm_floor	floor
+#define lj_vm_ceil	ceil
 #else
 LJ_ASMF double lj_vm_floor(double);
 LJ_ASMF double lj_vm_ceil(double);
@@ -67,7 +67,11 @@ LJ_ASMF void lj_vm_exp2_x87(void);
 LJ_ASMF void lj_vm_pow_sse(void);
 LJ_ASMF void lj_vm_powi_sse(void);
 #else
+#if LJ_TARGET_PPC
+#define lj_vm_trunc	trunc
+#else
 LJ_ASMF double lj_vm_trunc(double);
+#endif
 LJ_ASMF double lj_vm_powi(double, int32_t);
 #ifdef LUAJIT_NO_LOG2
 LJ_ASMF double lj_vm_log2(double);
diff --git a/src/vm_ppc.dasc b/src/vm_ppc.dasc
index bf46f694..db946190 100644
--- a/src/vm_ppc.dasc
+++ b/src/vm_ppc.dasc
@@ -2447,15 +2447,7 @@ static void build_subroutines(BuildCtx *ctx)
   |//-- Math helper functions ----------------------------------------------
   |//-----------------------------------------------------------------------
   |
-  |  // NYI: Use internal implementation.
-  |->vm_floor:
-  |  b extern floor
-  |->vm_ceil:
-  |  b extern ceil
-  |->vm_trunc:
-  |.if JIT
-  |  b extern trunc
-  |.endif
+  |// NYI: Use internal implementations of floor, ceil, trunc.
   |
   |->vm_modi:
   |  divwo. TMP0, CARG1, CARG2