diff --git a/src/pcm/Dsd16.cxx b/src/pcm/Dsd16.cxx
index 774a51ecc..5617bb04d 100644
--- a/src/pcm/Dsd16.cxx
+++ b/src/pcm/Dsd16.cxx
@@ -26,7 +26,7 @@
  * Construct a 16 bit integer from two bytes.
  */
 static constexpr inline uint16_t
-Construct16(uint8_t a, uint8_t b)
+Construct16(uint8_t a, uint8_t b) noexcept
 {
 	/* "a" is the oldest byte, which must be in the most
 	   significant byte */
@@ -35,13 +35,14 @@ Construct16(uint8_t a, uint8_t b)
 }
 
 static constexpr inline uint16_t
-Dsd8To16Sample(const uint8_t *src, unsigned channels)
+Dsd8To16Sample(const uint8_t *src, unsigned channels) noexcept
 {
 	return Construct16(src[0], src[channels]);
 }
 
 ConstBuffer<uint16_t>
-Dsd8To16(PcmBuffer &buffer, unsigned channels, ConstBuffer<uint8_t> _src)
+Dsd8To16(PcmBuffer &buffer, unsigned channels,
+	 ConstBuffer<uint8_t> _src) noexcept
 {
 	const size_t in_frames = _src.size / channels;
 	const size_t out_frames = in_frames / 2;
diff --git a/src/pcm/Dsd16.hxx b/src/pcm/Dsd16.hxx
index 47341868b..f9791cc2b 100644
--- a/src/pcm/Dsd16.hxx
+++ b/src/pcm/Dsd16.hxx
@@ -31,6 +31,7 @@ class PcmBuffer;
  * Convert DSD_U8 to DSD_U16 (native endian, oldest bits in MSB).
  */
 ConstBuffer<uint16_t>
-Dsd8To16(PcmBuffer &buffer, unsigned channels, ConstBuffer<uint8_t> src);
+Dsd8To16(PcmBuffer &buffer, unsigned channels,
+	 ConstBuffer<uint8_t> src) noexcept;
 
 #endif
diff --git a/src/pcm/Dsd32.cxx b/src/pcm/Dsd32.cxx
index 1e619efa7..da5f5c3a7 100644
--- a/src/pcm/Dsd32.cxx
+++ b/src/pcm/Dsd32.cxx
@@ -26,7 +26,7 @@
  * Construct a 32 bit integer from four bytes.
  */
 static constexpr inline uint32_t
-Construct32(uint8_t a, uint8_t b, uint8_t c, uint8_t d)
+Construct32(uint8_t a, uint8_t b, uint8_t c, uint8_t d) noexcept
 {
 	/* "a" is the oldest byte, which must be in the most
 	   significant byte */
@@ -36,14 +36,15 @@ Construct32(uint8_t a, uint8_t b, uint8_t c, uint8_t d)
 }
 
 static constexpr inline uint32_t
-Dsd8To32Sample(const uint8_t *src, unsigned channels)
+Dsd8To32Sample(const uint8_t *src, unsigned channels) noexcept
 {
 	return Construct32(src[0], src[channels],
 			   src[2 * channels], src[3 * channels]);
 }
 
 ConstBuffer<uint32_t>
-Dsd8To32(PcmBuffer &buffer, unsigned channels, ConstBuffer<uint8_t> _src)
+Dsd8To32(PcmBuffer &buffer, unsigned channels,
+	 ConstBuffer<uint8_t> _src) noexcept
 {
 	const size_t in_frames = _src.size / channels;
 	const size_t out_frames = in_frames / 4;
diff --git a/src/pcm/Dsd32.hxx b/src/pcm/Dsd32.hxx
index 5f68814f4..e3d1bdd6d 100644
--- a/src/pcm/Dsd32.hxx
+++ b/src/pcm/Dsd32.hxx
@@ -31,6 +31,7 @@ class PcmBuffer;
  * Convert DSD_U8 to DSD_U32 (native endian, oldest bits in MSB).
  */
 ConstBuffer<uint32_t>
-Dsd8To32(PcmBuffer &buffer, unsigned channels, ConstBuffer<uint8_t> src);
+Dsd8To32(PcmBuffer &buffer, unsigned channels,
+	 ConstBuffer<uint8_t> src) noexcept;
 
 #endif