diff --git a/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/lib/qa_utils.h b/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/lib/qa_utils.h
index aa3192524..b01a29bc1 100644
--- a/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/lib/qa_utils.h
+++ b/src/algorithms/libs/volk_gnsssdr_module/volk_gnsssdr/lib/qa_utils.h
@@ -19,6 +19,10 @@
 #ifndef GNSS_SDR_VOLK_QA_UTILS_H
 #define GNSS_SDR_VOLK_QA_UTILS_H
 
+#ifdef __APPLE__
+#define _DARWIN_C_SOURCE
+#endif
+
 #include <string>
 #include <iostream>
 #include <fstream>