diff --git a/CHANGELOG.md b/CHANGELOG.md
index a07397c..524c89a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## 0.4.4 (unreleased)
+
+- Improved error message for malformed vector literal
+
 ## 0.4.3 (2023-06-10)
 
 - Improved cost estimation
diff --git a/src/vector.c b/src/vector.c
index da51d92..be194eb 100644
--- a/src/vector.c
+++ b/src/vector.c
@@ -174,6 +174,7 @@ vector_in(PG_FUNCTION_ARGS)
 	char	   *pt;
 	char	   *stringEnd;
 	Vector	   *result;
+	char       *lit = pstrdup(str);
 
 	while (vector_isspace(*str))
 		str++;
@@ -181,7 +182,7 @@ vector_in(PG_FUNCTION_ARGS)
 	if (*str != '[')
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
-				 errmsg("malformed vector literal: \"%s\"", str),
+				 errmsg("malformed vector literal: \"%s\"", lit),
 				 errdetail("Vector contents must start with \"[\".")));
 
 	str++;
@@ -219,7 +220,7 @@ vector_in(PG_FUNCTION_ARGS)
 	if (*stringEnd != ']')
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
-				 errmsg("malformed vector literal"),
+				 errmsg("malformed vector literal: \"%s\"", lit),
 				 errdetail("Unexpected end of input.")));
 
 	stringEnd++;
@@ -231,7 +232,7 @@ vector_in(PG_FUNCTION_ARGS)
 	if (*stringEnd != '\0')
 		ereport(ERROR,
 				(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
-				 errmsg("malformed vector literal"),
+				 errmsg("malformed vector literal: \"%s\"", lit),
 				 errdetail("Junk after closing right brace.")));
 
 	if (dim < 1)
@@ -239,6 +240,8 @@ vector_in(PG_FUNCTION_ARGS)
 				(errcode(ERRCODE_DATA_EXCEPTION),
 				 errmsg("vector must have at least 1 dimension")));
 
+	pfree(lit);
+
 	CheckExpectedDim(typmod, dim);
 
 	result = InitVector(dim);
diff --git a/test/expected/input.out b/test/expected/input.out
index b6ccca4..d2cb1c6 100644
--- a/test/expected/input.out
+++ b/test/expected/input.out
@@ -43,12 +43,12 @@ ERROR:  infinite value not allowed in vector
 LINE 1: SELECT '[4e38,1]'::vector;
                ^
 SELECT '[1,2,3'::vector;
-ERROR:  malformed vector literal
+ERROR:  malformed vector literal: "[1,2,3"
 LINE 1: SELECT '[1,2,3'::vector;
                ^
 DETAIL:  Unexpected end of input.
 SELECT '[1,2,3]9'::vector;
-ERROR:  malformed vector literal
+ERROR:  malformed vector literal: "[1,2,3]9"
 LINE 1: SELECT '[1,2,3]9'::vector;
                ^
 DETAIL:  Junk after closing right brace.