diff --git a/sys/powerpc/include/spr.h b/sys/powerpc/include/spr.h
index 15556e43ba10..5a9c019c8a08 100644
--- a/sys/powerpc/include/spr.h
+++ b/sys/powerpc/include/spr.h
@@ -667,19 +667,7 @@
 #define	PMC970N_CYCLES		0xf /* Processor cycles */
 #define	PMC970N_ICOMP		0x9 /* Instructions completed */
 
-#if defined(AIM)
-
-#define	SPR_ESR			0x3d4	/* 4.. Exception Syndrome Register */
-#define	  ESR_MCI		  0x80000000 /* Machine check - instruction */
-#define	  ESR_PIL		  0x08000000 /* Program interrupt - illegal */
-#define	  ESR_PPR		  0x04000000 /* Program interrupt - privileged */
-#define	  ESR_PTR		  0x02000000 /* Program interrupt - trap */
-#define	  ESR_ST		  0x01000000 /* Store operation */
-#define	  ESR_DST		  0x00800000 /* Data storage interrupt - store fault */
-#define	  ESR_DIZ		  0x00800000 /* Data/instruction storage interrupt - zone fault */
-#define	  ESR_U0F		  0x00008000 /* Data storage interrupt - U0 fault */
-
-#elif defined(BOOKE)
+#if defined(BOOKE)
 
 #define	SPR_MCARU		0x239	/* ..8 Machine Check Address register upper bits */
 #define	SPR_MCSR		0x23c	/* ..8 Machine Check Syndrome register */