diff --git a/core/indigo-core/molecule/src/base_molecule.cpp b/core/indigo-core/molecule/src/base_molecule.cpp
index c5a4a3c7e2..0551198ded 100644
--- a/core/indigo-core/molecule/src/base_molecule.cpp
+++ b/core/indigo-core/molecule/src/base_molecule.cpp
@@ -4538,7 +4538,9 @@ void BaseMolecule::getAtomBoundingBox(int atom_idx, float font_size, LABEL_MODE
     if (font_size <= EPSILON)
         return;
 
-    float symbol_size = font_size * 0.7f;
+    float constexpr WIDTH_FACTOR = 0.7f; // width of font symbols
+
+    float symbol_size = font_size * WIDTH_FACTOR;
 
     if (isPseudoAtom(atom_idx) || isTemplateAtom(atom_idx))
     {