diff --git a/src/blackmisc/geolatitude.h b/src/blackmisc/geolatitude.h
index 5f5fd66a1..82fb40285 100644
--- a/src/blackmisc/geolatitude.h
+++ b/src/blackmisc/geolatitude.h
@@ -35,7 +35,7 @@ public:
      * \brief Constructor
      * \param angle
      */
-    CLatitude(const BlackMisc::PhysicalQuantities::CAngle &angle) : CEarthAngle(angle) {}
+    explicit CLatitude(const BlackMisc::PhysicalQuantities::CAngle &angle) : CEarthAngle(angle) {}
 
     /*!
      * \brief Init by double value
diff --git a/src/blackmisc/geolongitude.h b/src/blackmisc/geolongitude.h
index 8ab0e9e8a..64880ef51 100644
--- a/src/blackmisc/geolongitude.h
+++ b/src/blackmisc/geolongitude.h
@@ -32,7 +32,7 @@ public:
      * \brief Constructor
      * \param angle
      */
-    CLongitude(const BlackMisc::PhysicalQuantities::CAngle &angle) : CEarthAngle(angle) {}
+    explicit CLongitude(const BlackMisc::PhysicalQuantities::CAngle &angle) : CEarthAngle(angle) {}
 
     /*!
      * \brief Init by double value