diff --git a/common/plugins/altium/altium_parser.cpp b/common/plugins/altium/altium_parser.cpp
index 5f9f412e77..2b61bb999e 100644
--- a/common/plugins/altium/altium_parser.cpp
+++ b/common/plugins/altium/altium_parser.cpp
@@ -176,7 +176,7 @@ std::map<wxString, wxString> ALTIUM_PARSER::ReadProperties()
 
 int32_t ALTIUM_PARSER::ConvertToKicadUnit( const double aValue )
 {
-    const double int_limit = ( std::numeric_limits<int>::max() - 1 ) / 2.54;
+    constexpr double int_limit = ( std::numeric_limits<int>::max() - 1 ) / 2.54;
 
     int32_t iu = KiROUND( Clamp<double>( -int_limit, aValue, int_limit ) * 2.54 );
 
diff --git a/eeschema/sch_plugins/kicad/sch_sexpr_parser.cpp b/eeschema/sch_plugins/kicad/sch_sexpr_parser.cpp
index fbe9d4ad8f..469f8fe0dc 100644
--- a/eeschema/sch_plugins/kicad/sch_sexpr_parser.cpp
+++ b/eeschema/sch_plugins/kicad/sch_sexpr_parser.cpp
@@ -448,7 +448,7 @@ int SCH_SEXPR_PARSER::parseInternalUnits()
     // Schematic internal units are represented as integers.  Any values that are
     // larger or smaller than the schematic units represent undefined behavior for
     // the system.  Limit values to the largest that can be displayed on the screen.
-    double int_limit = std::numeric_limits<int>::max() * 0.7071; // 0.7071 = roughly 1/sqrt(2)
+    constexpr double int_limit = std::numeric_limits<int>::max() * 0.7071; // 0.7071 = roughly 1/sqrt(2)
 
     return KiROUND( Clamp<double>( -int_limit, retval, int_limit ) );
 }
@@ -458,7 +458,7 @@ int SCH_SEXPR_PARSER::parseInternalUnits( const char* aExpected )
 {
     auto retval = parseDouble( aExpected ) * IU_PER_MM;
 
-    double int_limit = std::numeric_limits<int>::max() * 0.7071;
+    constexpr double int_limit = std::numeric_limits<int>::max() * 0.7071;
 
     return KiROUND( Clamp<double>( -int_limit, retval, int_limit ) );
 }
diff --git a/pcbnew/plugins/kicad/pcb_parser.cpp b/pcbnew/plugins/kicad/pcb_parser.cpp
index 38e86bb3ed..eb08c2e502 100644
--- a/pcbnew/plugins/kicad/pcb_parser.cpp
+++ b/pcbnew/plugins/kicad/pcb_parser.cpp
@@ -208,7 +208,8 @@ int PCB_PARSER::parseBoardUnits()
     // larger or smaller than those board units represent undefined behavior for
     // the system.  We limit values to the largest that is visible on the screen
     // This is the diagonal distance of the full screen ~1.5m
-    double int_limit = std::numeric_limits<int>::max() * 0.7071; // 0.7071 = roughly 1/sqrt(2)
+    constexpr double int_limit =
+            std::numeric_limits<int>::max() * 0.7071; // 0.7071 = roughly 1/sqrt(2)
     return KiROUND( Clamp<double>( -int_limit, retval, int_limit ) );
 }
 
@@ -220,7 +221,7 @@ int PCB_PARSER::parseBoardUnits( const char* aExpected )
     // N.B. we currently represent board units as integers.  Any values that are
     // larger or smaller than those board units represent undefined behavior for
     // the system.  We limit values to the largest that is visible on the screen
-    double int_limit = std::numeric_limits<int>::max() * 0.7071;
+    constexpr double int_limit = std::numeric_limits<int>::max() * 0.7071;
 
     // Use here #KiROUND, not EKIROUND (see comments about them) when having a function as
     // argument, because it will be called twice with #KIROUND.