diff --git a/src/Airports/GenAirports/rwy_nonprec.cxx b/src/Airports/GenAirports/rwy_nonprec.cxx
index 7fe2d46b..93110c6c 100644
--- a/src/Airports/GenAirports/rwy_nonprec.cxx
+++ b/src/Airports/GenAirports/rwy_nonprec.cxx
@@ -245,7 +245,7 @@ void gen_non_precision_rwy( const TGRunway& rwy_info,
 	    letter = "R";
 	    rev_letter = "L";
 	} else if ( tmp == "C" ) {
-	    letter == "C";
+	    letter = "C";
 	    rev_letter = "C";
 	}
     }
diff --git a/src/Airports/GenAirports/rwy_prec.cxx b/src/Airports/GenAirports/rwy_prec.cxx
index ce5542ee..a7952a05 100644
--- a/src/Airports/GenAirports/rwy_prec.cxx
+++ b/src/Airports/GenAirports/rwy_prec.cxx
@@ -249,7 +249,7 @@ void gen_precision_rwy( const TGRunway& rwy_info,
 	    letter = "R";
 	    rev_letter = "L";
 	} else if ( tmp == "C" ) {
-	    letter == "C";
+	    letter = "C";
 	    rev_letter = "C";
 	}
     }
diff --git a/src/Airports/GenAirports/rwy_visual.cxx b/src/Airports/GenAirports/rwy_visual.cxx
index 32f19eba..e0f9c9ca 100644
--- a/src/Airports/GenAirports/rwy_visual.cxx
+++ b/src/Airports/GenAirports/rwy_visual.cxx
@@ -251,7 +251,7 @@ void gen_visual_rwy( const TGRunway& rwy_info,
 	    letter = "R";
 	    rev_letter = "L";
 	} else if ( tmp == "C" ) {
-	    letter == "C";
+	    letter = "C";
 	    rev_letter = "C";
 	}
     }