diff --git a/src/symboltable.rs b/src/symboltable.rs
index f1cc1a8..d64dd5b 100644
--- a/src/symboltable.rs
+++ b/src/symboltable.rs
@@ -746,10 +746,15 @@ impl SymbolTableBuilder {
             // Role already set..
             match role {
                 SymbolUsage::Global => {
-                    return Err(SymbolTableError {
-                        error: format!("name '{}' is used prior to global declaration", name),
-                        location,
-                    })
+                    let symbol = table.symbols.get(name).unwrap();
+                    if let SymbolScope::Global = symbol.scope {
+                        // Ok
+                    } else {
+                        return Err(SymbolTableError {
+                            error: format!("name '{}' is used prior to global declaration", name),
+                            location,
+                        });
+                    }
                 }
                 SymbolUsage::Nonlocal => {
                     return Err(SymbolTableError {
@@ -806,6 +811,8 @@ impl SymbolTableBuilder {
             SymbolUsage::Global => {
                 if let SymbolScope::Unknown = symbol.scope {
                     symbol.scope = SymbolScope::Global;
+                } else if let SymbolScope::Global = symbol.scope {
+                    // Global scope can be set to global
                 } else {
                     return Err(SymbolTableError {
                         error: format!("Symbol {} scope cannot be set to global, since its scope was already determined otherwise.", name),