diff --git a/src/hdf/dataobject.c b/src/hdf/dataobject.c
index 2039c77..8d7de4d 100644
--- a/src/hdf/dataobject.c
+++ b/src/hdf/dataobject.c
@@ -622,7 +622,7 @@ static int readOHDRHeaderMessageGroupInfo(struct READER *reader,
 static int readOHDRHeaderMessageFilterPipelineV1(struct READER *reader,
                                                  uint8_t filters) {
   int i, j;
-  uint16_t filter_identification_value, flags, number_client_data_values,
+  uint16_t filter_identification_value, number_client_data_values,
       namelength;
 
   if (readValue(reader, 6) != 0) {
@@ -645,7 +645,7 @@ static int readOHDRHeaderMessageFilterPipelineV1(struct READER *reader,
       // LCOV_EXCL_STOP
     }
     namelength = (uint16_t)readValue(reader, 2);
-    flags = (uint16_t)readValue(reader, 2);
+    readValue(reader, 2);
     number_client_data_values = (uint16_t)readValue(reader, 2);
 
     if (namelength > 0)
diff --git a/src/hrtf/mysofa.h b/src/hrtf/mysofa.h
index 1c6e45b..206e77b 100644
--- a/src/hrtf/mysofa.h
+++ b/src/hrtf/mysofa.h
@@ -12,6 +12,7 @@ extern "C" {
 
 #include <stdbool.h>
 #include <stdint.h>
+#include <stddef.h>
 
 #define MYSOFA_DEFAULT_NEIGH_STEP_ANGLE 0.5f
 #define MYSOFA_DEFAULT_NEIGH_STEP_RADIUS 0.01f
@@ -162,8 +163,8 @@ struct MYSOFA_EASY *mysofa_cache_store(struct MYSOFA_EASY *,
 void mysofa_cache_release(struct MYSOFA_EASY *);
 void mysofa_cache_release_all(void);
 
-void mysofa_c2s(float *values);
-void mysofa_s2c(float *values);
+void mysofa_c2s(float values[3]);
+void mysofa_s2c(float values[3]);
 
 struct MYSOFA_EASY {
   struct MYSOFA_HRTF *hrtf;