diff --git a/gcc/config/rs6000/aix71.h b/gcc/config/rs6000/aix71.h
index 3612ed2593b..807e260a175 100644
--- a/gcc/config/rs6000/aix71.h
+++ b/gcc/config/rs6000/aix71.h
@@ -272,9 +272,9 @@ extern long long int    atoll(const char *);
 
 #define TARGET_AIX_VERSION 71
 
-/* AIX 7.1 supports DWARF3 debugging, but XCOFF remains the default.  */
+/* AIX 7.1 supports DWARF3+ debugging.  */
 #define DWARF2_DEBUGGING_INFO 1
-#define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 #define DEBUG_INFO_SECTION	"0x10000"
 #define DEBUG_LINE_SECTION	"0x20000"
 #define DEBUG_PUBNAMES_SECTION	"0x30000"
diff --git a/gcc/config/rs6000/aix72.h b/gcc/config/rs6000/aix72.h
index d34909283cc..36c5d994439 100644
--- a/gcc/config/rs6000/aix72.h
+++ b/gcc/config/rs6000/aix72.h
@@ -273,9 +273,9 @@ extern long long int    atoll(const char *);
 
 #define TARGET_AIX_VERSION 72
 
-/* AIX 7.2 supports DWARF3 debugging, but XCOFF remains the default.  */
+/* AIX 7.2 supports DWARF3+ debugging.  */
 #define DWARF2_DEBUGGING_INFO 1
-#define PREFERRED_DEBUGGING_TYPE XCOFF_DEBUG
+#define PREFERRED_DEBUGGING_TYPE DWARF2_DEBUG
 #define DEBUG_INFO_SECTION	"0x10000"
 #define DEBUG_LINE_SECTION	"0x20000"
 #define DEBUG_PUBNAMES_SECTION	"0x30000"