diff --git a/brownie/project/compiler/utils.py b/brownie/project/compiler/utils.py
index 7c0627094..c4e7be4e7 100644
--- a/brownie/project/compiler/utils.py
+++ b/brownie/project/compiler/utils.py
@@ -8,6 +8,12 @@
 
 def expand_source_map(source_map_str: str) -> List:
     # Expands the compressed sourceMap supplied by solc into a list of lists
+    
+    if isinstance(source_map_str, dict):
+        source_map_str = str(source_map_str)
+    if not isinstance(source_map_str, str):
+        raise TypeError(source_map_str) from None
+        
     source_map: List = [_expand_row(i) if i else None for i in source_map_str.split(";")]
     for i, value in enumerate(source_map[1:], 1):
         if value is None: