diff --git a/src/blocks/block.rs b/src/blocks/block.rs
index 6e03f9c..4e5680b 100644
--- a/src/blocks/block.rs
+++ b/src/blocks/block.rs
@@ -51,11 +51,15 @@ impl<'src> Block<'src> {
         let line = source.take_normalized_line();
         if line.item.contains("::") {
             let mut macro_block_maw = MacroBlock::parse(source);
-            if !macro_block_maw.warnings.is_empty() {
-                warnings.append(&mut macro_block_maw.warnings);
-            }
 
             if let Some(macro_block) = macro_block_maw.item {
+                // Only propagate warnings from macro block parsing if we think this
+                // *is* a macro block. Otherwise, there would likely be too many false
+                // positives.
+                if !macro_block_maw.warnings.is_empty() {
+                    warnings.append(&mut macro_block_maw.warnings);
+                }
+
                 return MatchAndWarnings {
                     item: Some(MatchedItem {
                         item: Self::Macro(macro_block.item),
diff --git a/src/tests/blocks/block.rs b/src/tests/blocks/block.rs
index bff2bbd..f6c07d6 100644
--- a/src/tests/blocks/block.rs
+++ b/src/tests/blocks/block.rs
@@ -181,8 +181,10 @@ mod r#macro {
             attributes::{TAttrlist, TElementAttribute},
             blocks::{TBlock, TMacroBlock, TSimpleBlock},
             inlines::{TInline, TInlineMacro},
+            warnings::TWarning,
             TSpan,
         },
+        warnings::WarningType,
         HasSpan, Span,
     };
 
@@ -586,6 +588,142 @@ mod r#macro {
             }
         );
     }
+
+    #[test]
+    fn warn_attrlist_has_extra_comma() {
+        let maw = Block::parse(Span::new("foo::bar[alt=Sunset,width=300,,height=400]"));
+
+        let mi = maw.item.as_ref().unwrap().clone();
+
+        assert_eq!(
+            mi.item,
+            TBlock::Macro(TMacroBlock {
+                name: TSpan {
+                    data: "foo",
+                    line: 1,
+                    col: 1,
+                    offset: 0,
+                },
+                target: Some(TSpan {
+                    data: "bar",
+                    line: 1,
+                    col: 6,
+                    offset: 5,
+                }),
+                attrlist: TAttrlist {
+                    attributes: vec!(
+                        TElementAttribute {
+                            name: Some(TSpan {
+                                data: "alt",
+                                line: 1,
+                                col: 10,
+                                offset: 9,
+                            }),
+                            shorthand_items: vec![],
+                            value: TSpan {
+                                data: "Sunset",
+                                line: 1,
+                                col: 14,
+                                offset: 13,
+                            },
+                            source: TSpan {
+                                data: "alt=Sunset",
+                                line: 1,
+                                col: 10,
+                                offset: 9,
+                            },
+                        },
+                        TElementAttribute {
+                            name: Some(TSpan {
+                                data: "width",
+                                line: 1,
+                                col: 21,
+                                offset: 20,
+                            }),
+                            shorthand_items: vec![],
+                            value: TSpan {
+                                data: "300",
+                                line: 1,
+                                col: 27,
+                                offset: 26,
+                            },
+                            source: TSpan {
+                                data: "width=300",
+                                line: 1,
+                                col: 21,
+                                offset: 20,
+                            },
+                        },
+                        TElementAttribute {
+                            name: Some(TSpan {
+                                data: "height",
+                                line: 1,
+                                col: 32,
+                                offset: 31,
+                            }),
+                            shorthand_items: vec![],
+                            value: TSpan {
+                                data: "400",
+                                line: 1,
+                                col: 39,
+                                offset: 38,
+                            },
+                            source: TSpan {
+                                data: "height=400",
+                                line: 1,
+                                col: 32,
+                                offset: 31,
+                            },
+                        }
+                    ),
+                    source: TSpan {
+                        data: "alt=Sunset,width=300,,height=400",
+                        line: 1,
+                        col: 10,
+                        offset: 9,
+                    }
+                },
+                source: TSpan {
+                    data: "foo::bar[alt=Sunset,width=300,,height=400]",
+                    line: 1,
+                    col: 1,
+                    offset: 0,
+                },
+            })
+        );
+
+        assert_eq!(
+            mi.item.span(),
+            TSpan {
+                data: "foo::bar[alt=Sunset,width=300,,height=400]",
+                line: 1,
+                col: 1,
+                offset: 0,
+            }
+        );
+
+        assert_eq!(
+            mi.after,
+            TSpan {
+                data: "",
+                line: 1,
+                col: 43,
+                offset: 42
+            }
+        );
+        assert_eq!(
+            maw.warnings,
+            vec![TWarning {
+                source: TSpan {
+                    data: ",",
+                    line: 1,
+                    col: 30,
+                    offset: 29,
+                },
+                warning: WarningType::EmptyAttributeValue,
+            }]
+        );
+    }
 }
 
 mod section {