diff --git a/common_power.h b/common_power.h
index e0685f760..0f1001cb6 100644
--- a/common_power.h
+++ b/common_power.h
@@ -844,8 +844,8 @@ Lmcount$lazy_ptr:
 #define BUFFER_SIZE     (  2 << 20)
 #elif defined(PPC440FP2)
 #define BUFFER_SIZE     ( 16 << 20)
-#elif defined(POWER8) || defined(POWER9) || defined(POWER10)
-#define BUFFER_SIZE     ( 64 << 20)
+#elif defined(POWER6) || defined(POWER8) || defined(POWER9) || defined(POWER10)
+#define BUFFER_SIZE     ( 32 << 22)
 #else
 #define BUFFER_SIZE     ( 16 << 20)
 #endif