diff --git a/src/runtime/malloc.go b/src/runtime/malloc.go
index b68820c9a7..3172d60911 100644
--- a/src/runtime/malloc.go
+++ b/src/runtime/malloc.go
@@ -588,6 +588,9 @@ func mallocinit() {
 			topBits := (randHeapAddrBits - logHeapArenaBytes)
 			randHeapBase = nextHeapRandBits(topBits) << (randHeapAddrBits - topBits)
 			randHeapBase = alignUp(randHeapBase, heapArenaBytes)
+			if GOOS == "aix" {
+				randHeapBase += arenaBaseOffset
+			}
 			randHeapBasePrefix = byte(randHeapBase >> (randHeapAddrBits - 8))
 		}
 
@@ -623,7 +626,11 @@ func mallocinit() {
 				}
 			case randomizeHeapBase:
 				prefix := uintptr(randHeapBasePrefix+byte(i)) << (randHeapAddrBits - 8)
-				p = prefix | (randHeapBase & randHeapBasePrefixMask)
+				if GOOS == "aix" {
+					p = arenaBaseOffset + (prefix | ((randHeapBase - arenaBaseOffset) & randHeapBasePrefixMask))
+				} else {
+					p = prefix | (randHeapBase & randHeapBasePrefixMask)
+				}
 			case GOARCH == "arm64" && GOOS == "ios":
 				p = uintptr(i)<<40 | uintptrMask&(0x0013<<28)
 			case GOARCH == "arm64":
diff --git a/src/runtime/mem_aix.go b/src/runtime/mem_aix.go
index 1203af5797..343f73c771 100644
--- a/src/runtime/mem_aix.go
+++ b/src/runtime/mem_aix.go
@@ -61,6 +61,10 @@ func sysReserveOS(v unsafe.Pointer, n uintptr, _ string) unsafe.Pointer {
 	if err != 0 {
 		return nil
 	}
+	if uintptr(p) < arenaBaseOffsetUintptr {
+		munmap(p, n)
+		return nil
+	}
 	return p
 }