diff --git a/libctru/source/ndsp/ndsp.c b/libctru/source/ndsp/ndsp.c
index e868bc0..9e31c4e 100644
--- a/libctru/source/ndsp/ndsp.c
+++ b/libctru/source/ndsp/ndsp.c
@@ -502,7 +502,7 @@ static bool ndspFindAndLoadComponent(void)
 	{
 		extern u32 fake_heap_end;
 		u32 mapAddr = (fake_heap_end+0xFFF) &~ 0xFFF;
-		rc = svcMapMemoryBlock(rsrc, mapAddr, 0x3, 0x3);
+		rc = svcMapMemoryBlock(rsrc, mapAddr, MEMPERM_READWRITE, MEMPERM_READWRITE);
 		if (R_FAILED(rc)) break;
 
 		componentSize = *(u32*)(mapAddr + 0x104);
diff --git a/libctru/source/services/csnd.c b/libctru/source/services/csnd.c
index ce00c8b..62d6e6c 100644
--- a/libctru/source/services/csnd.c
+++ b/libctru/source/services/csnd.c
@@ -207,7 +207,7 @@ Result csndInit(void)
 		goto cleanup1;
 	}
 
-	ret = svcMapMemoryBlock(csndSharedMemBlock, (u32)csndSharedMem, 3, 0x10000000);
+	ret = svcMapMemoryBlock(csndSharedMemBlock, (u32)csndSharedMem, MEMPERM_READWRITE, MEMPERM_DONTCARE);
 	if (R_FAILED(ret)) goto cleanup2;
 
 	memset((void*)csndSharedMem, 0, csndSharedMemSize);
diff --git a/libctru/source/services/irrst.c b/libctru/source/services/irrst.c
index 6ea6e83..fe143bb 100644
--- a/libctru/source/services/irrst.c
+++ b/libctru/source/services/irrst.c
@@ -46,7 +46,7 @@ Result irrstInit(void)
 		goto cleanup1;
 	}
 
-	if(R_FAILED(ret = svcMapMemoryBlock(irrstMemHandle, (u32)irrstSharedMem, MEMPERM_READ, 0x10000000))) goto cleanup2;
+	if(R_FAILED(ret = svcMapMemoryBlock(irrstMemHandle, (u32)irrstSharedMem, MEMPERM_READ, MEMPERM_DONTCARE))) goto cleanup2;
 
 	return 0;