diff --git a/fpga/include/villas/fpga/ips/rtds.hpp b/fpga/include/villas/fpga/ips/rtds.hpp
index e46f4a1c6..8027c3be8 100644
--- a/fpga/include/villas/fpga/ips/rtds.hpp
+++ b/fpga/include/villas/fpga/ips/rtds.hpp
@@ -52,3 +52,9 @@ private:
 } // namespace ip
 } // namespace fpga
 } // namespace villas
+
+#ifndef FMT_LEGACY_OSTREAM_FORMATTER
+template <>
+class fmt::formatter<villas::fpga::ip::RtdsGtfpga>
+    : public fmt::ostream_formatter {};
+#endif
diff --git a/fpga/tests/unit/dma.c b/fpga/tests/unit/dma.c
index 7b9ac2949..436bb5ddf 100644
--- a/fpga/tests/unit/dma.c
+++ b/fpga/tests/unit/dma.c
@@ -17,8 +17,6 @@ int main(int argc, char *argv[])
 	villasfpga_handle vh;
 	villasfpga_memory mem1, mem2;
 	void *mem1ptr, *mem2ptr;
-	char line[1024];
-	float f;
 	size_t size;
 
 	if (argv == NULL) {