diff --git a/python/src/com/jetbrains/python/parsing/ExpressionParsing.java b/python/src/com/jetbrains/python/parsing/ExpressionParsing.java
index bc11498e7dc1..46a7de502ad5 100644
--- a/python/src/com/jetbrains/python/parsing/ExpressionParsing.java
+++ b/python/src/com/jetbrains/python/parsing/ExpressionParsing.java
@@ -103,10 +103,10 @@ public class ExpressionParsing extends Parsing {
     }
     else {
       while (builder.getTokenType() != PyTokenTypes.RBRACKET) {
-        if (builder.getTokenType() == PyTokenTypes.COMMA) {
-          builder.advanceLexer();
+        if (!matchToken(PyTokenTypes.COMMA)) {
+          builder.error("expected ',' or ']'");
         }
-        else if (!parseSingleExpression(isTargetExpression)) {
+        if (!parseSingleExpression(isTargetExpression)) {
           builder.error(message("PARSE.expected.expr.or.comma.or.bracket"));
           break;
         }
diff --git a/python/testData/psi/MissingListSeparators.py b/python/testData/psi/MissingListSeparators.py
new file mode 100644
index 000000000000..7e3c715664c9
--- /dev/null
+++ b/python/testData/psi/MissingListSeparators.py
@@ -0,0 +1 @@
+a = [1 2 3]
\ No newline at end of file
diff --git a/python/testData/psi/MissingListSeparators.txt b/python/testData/psi/MissingListSeparators.txt
new file mode 100644
index 000000000000..600a2add7a9b
--- /dev/null
+++ b/python/testData/psi/MissingListSeparators.txt
@@ -0,0 +1,22 @@
+PyFile:MissingListSeparators.py
+  PyAssignmentStatement
+    PyTargetExpression: a
+      PsiElement(Py:IDENTIFIER)('a')
+    PsiWhiteSpace(' ')
+    PsiElement(Py:EQ)('=')
+    PsiWhiteSpace(' ')
+    PyListLiteralExpression
+      PsiElement(Py:LBRACKET)('[')
+      PyNumericLiteralExpression
+        PsiElement(Py:INTEGER_LITERAL)('1')
+      PsiErrorElement:expected ',' or ']'
+        <empty list>
+      PsiWhiteSpace(' ')
+      PyNumericLiteralExpression
+        PsiElement(Py:INTEGER_LITERAL)('2')
+      PsiErrorElement:expected ',' or ']'
+        <empty list>
+      PsiWhiteSpace(' ')
+      PyNumericLiteralExpression
+        PsiElement(Py:INTEGER_LITERAL)('3')
+      PsiElement(Py:RBRACKET)(']')
\ No newline at end of file
diff --git a/python/testSrc/com/jetbrains/python/PythonParsingTest.java b/python/testSrc/com/jetbrains/python/PythonParsingTest.java
index de97885d664f..cd5149d9d603 100644
--- a/python/testSrc/com/jetbrains/python/PythonParsingTest.java
+++ b/python/testSrc/com/jetbrains/python/PythonParsingTest.java
@@ -214,6 +214,10 @@ public class PythonParsingTest extends ParsingTestCase {
     doTest();
   }
 
+  public void testMissingListSeparators() {  // PY-1933
+    doTest();
+  }
+
   public void doTest() {
     doTest(LanguageLevel.PYTHON25);
   }