diff --git a/src/gallium/drivers/r600/sfn/sfn_instr_mem.cpp b/src/gallium/drivers/r600/sfn/sfn_instr_mem.cpp
index 457ee011992..4e3be66eae2 100644
--- a/src/gallium/drivers/r600/sfn/sfn_instr_mem.cpp
+++ b/src/gallium/drivers/r600/sfn/sfn_instr_mem.cpp
@@ -111,6 +111,11 @@ GDSInstr::emit_atomic_counter(nir_intrinsic_instr *intr, Shader& shader)
    }
 }
 
+uint8_t GDSInstr::allowed_src_chan_mask() const
+{
+   return m_src.free_chan_mask();
+}
+
 static ESDOp
 get_opcode(const nir_intrinsic_op opcode)
 {
diff --git a/src/gallium/drivers/r600/sfn/sfn_instr_mem.h b/src/gallium/drivers/r600/sfn/sfn_instr_mem.h
index 4e9b0c1e168..5c05cc70dc0 100644
--- a/src/gallium/drivers/r600/sfn/sfn_instr_mem.h
+++ b/src/gallium/drivers/r600/sfn/sfn_instr_mem.h
@@ -57,6 +57,7 @@ public:
 
    static bool emit_atomic_counter(nir_intrinsic_instr *intr, Shader& shader);
    uint32_t slots() const override { return 1; };
+   uint8_t allowed_src_chan_mask() const override;
 
 private:
    static bool emit_atomic_read(nir_intrinsic_instr *intr, Shader& shader);