diff --git a/include/asm/section.h b/include/asm/section.h
index 219b682d..5b2672d2 100644
--- a/include/asm/section.h
+++ b/include/asm/section.h
@@ -22,6 +22,8 @@ struct Section {
 	char *name;
 	enum SectionType type;
 	enum SectionModifier modifier;
+	struct FileStackNode *src; /* Where the section was defined */
+	uint32_t fileLine; /* Line where the section was defined */
 	uint32_t size;
 	uint32_t org;
 	uint32_t bank;
diff --git a/src/asm/section.c b/src/asm/section.c
index 40c7a1c6..22f9d557 100644
--- a/src/asm/section.c
+++ b/src/asm/section.c
@@ -230,8 +230,9 @@ static void mergeSections(struct Section *sect, enum SectionType type, uint32_t
 			break;
 
 		case SECTION_NORMAL:
-			// TODO: this should report where the section was defined
-			fail("Section already defined previously\n");
+			fail("Section already defined previously at ");
+			fstk_Dump(sect->src, sect->fileLine);
+			putc('\n', stderr);
 			break;
 		}
 	}
@@ -325,6 +326,8 @@ static struct Section *getSection(char const *name, enum SectionType type, uint3
 
 	sect->type = type;
 	sect->modifier = mod;
+	sect->src = fstk_GetFileStack();
+	sect->fileLine = lexer_GetLineNo();
 	sect->size = 0;
 	sect->org = org;
 	sect->bank = bank;
diff --git a/test/asm/duplicate-section.err b/test/asm/duplicate-section.err
index 3d766a39..3ee901d5 100644
--- a/test/asm/duplicate-section.err
+++ b/test/asm/duplicate-section.err
@@ -1,4 +1,4 @@
 ERROR: duplicate-section.asm(4):
-    Section already defined previously
+    Section already defined previously at duplicate-section.asm(2)
 FATAL: duplicate-section.asm(4):
     Cannot create section "sec" (1 error)