diff --git a/common/filename_resolver.cpp b/common/filename_resolver.cpp
index 3139c6028b..93bda01b10 100644
--- a/common/filename_resolver.cpp
+++ b/common/filename_resolver.cpp
@@ -974,7 +974,7 @@ bool FILENAME_RESOLVER::ValidateFileName( const wxString& aFileName, bool& hasAl
 
     wxString filename = aFileName;
     wxString lpath;
-    size_t aliasStart = aFileName.starts_with( ':' ) ? 1 : 0;
+    size_t aliasStart = aFileName.StartsWith( ':' ) ? 1 : 0;
     size_t aliasEnd = aFileName.find( ':', aliasStart );
 
     // ensure that the file separators suit the current platform
diff --git a/utils/kicad2step/pcb/3d_resolver.cpp b/utils/kicad2step/pcb/3d_resolver.cpp
index 51519b3a08..a9d43c5ab1 100644
--- a/utils/kicad2step/pcb/3d_resolver.cpp
+++ b/utils/kicad2step/pcb/3d_resolver.cpp
@@ -909,7 +909,7 @@ bool S3D_RESOLVER::ValidateFileName( const wxString& aFileName, bool& hasAlias )
 
     wxString filename = aFileName;
     wxString lpath;
-    size_t aliasStart = aFileName.starts_with( ':' ) ? 1 : 0;
+    size_t aliasStart = aFileName.StartsWith( ':' ) ? 1 : 0;
     size_t aliasEnd = aFileName.find( ':' );
 
     // ensure that the file separators suit the current platform