diff --git a/src/main/lang/prolog.bnf b/src/main/lang/prolog.bnf
index 44f5505..c02729c 100644
--- a/src/main/lang/prolog.bnf
+++ b/src/main/lang/prolog.bnf
@@ -93,7 +93,7 @@ list_constructor ::= '[' ']' | '[' primary '|' primary ']' | '[' primary ']'
 
 common_val ::= common_predicate | ident | literal | list_constructor | '_'
 
-private common_val_or_paren ::= common_val | '(' common_val ')' | '{' common_val '}'
+private common_val_or_paren ::= common_val | '(' primary ')' | '{' primary '}'
 
 private primary ::= (common_val_or_paren | logical_not | operator_id) (common_val_or_paren | equiv_binary | logical_or  | operator_id)*
 
diff --git a/src/test/scala/parser/PrologParsingTestCaseBase.scala b/src/test/scala/parser/PrologParsingTestCaseBase.scala
index ff926b0..e0b084a 100644
--- a/src/test/scala/parser/PrologParsingTestCaseBase.scala
+++ b/src/test/scala/parser/PrologParsingTestCaseBase.scala
@@ -14,6 +14,10 @@ class PrologParsingTestCaseBase extends ParsingTestCase("", "pl", new PrologPars
     doTest(true)
   }
 
+  def testIssue20(): Unit = {
+    doTest(true)
+  }
+
   override def includeRanges(): Boolean = true
 
   override def skipSpaces(): Boolean = true
diff --git a/src/test/testData/Issue20.pl b/src/test/testData/Issue20.pl
new file mode 100644
index 0000000..cf6a836
--- /dev/null
+++ b/src/test/testData/Issue20.pl
@@ -0,0 +1,7 @@
+ast(Tokens, Out, Options) :-
+    catch(
+        (
+            maplist,
+            debug(ast, "Renamed", [Renamed])
+        )
+    ).
\ No newline at end of file
diff --git a/src/test/testData/Issue20.txt b/src/test/testData/Issue20.txt
new file mode 100644
index 0000000..36243ba
--- /dev/null
+++ b/src/test/testData/Issue20.txt
@@ -0,0 +1,70 @@
+FILE(0,132)
+  PrologToplevelExprImpl(TOPLEVEL_EXPR)(0,131)
+    PrologExprHeadImpl(EXPR_HEAD)(0,25)
+      PrologPredicateImpl(PREDICATE)(0,25)
+        PrologPredicateIdImpl(PREDICATE_ID)(0,3)
+          PsiElement(const_id)('ast')(0,3)
+        PrologParameterListImpl(PARAMETER_LIST)(3,25)
+          PsiElement(()('(')(3,4)
+          PrologCommonValImpl(COMMON_VAL)(4,10)
+            PrologIdentImpl(IDENT)(4,10)
+              PsiElement(atom_id)('Tokens')(4,10)
+          PrologEquivBinaryImpl(EQUIV_BINARY)(10,24)
+            PrologLogicalAndImpl(LOGICAL_AND)(10,24)
+              PsiElement(,)(',')(10,11)
+              PrologCommonValImpl(COMMON_VAL)(12,15)
+                PrologIdentImpl(IDENT)(12,15)
+                  PsiElement(atom_id)('Out')(12,15)
+              PrologEquivBinaryImpl(EQUIV_BINARY)(15,24)
+                PrologLogicalAndImpl(LOGICAL_AND)(15,24)
+                  PsiElement(,)(',')(15,16)
+                  PrologCommonValImpl(COMMON_VAL)(17,24)
+                    PrologIdentImpl(IDENT)(17,24)
+                      PsiElement(atom_id)('Options')(17,24)
+          PsiElement())(')')(24,25)
+    PsiElement(:-)(':-')(26,28)
+    PrologExprBodyImpl(EXPR_BODY)(33,131)
+      PrologCommonValImpl(COMMON_VAL)(33,131)
+        PrologCommonPredicateImpl(COMMON_PREDICATE)(33,131)
+          PrologRefPredicateIdImpl(REF_PREDICATE_ID)(33,38)
+            PsiElement(const_id)('catch')(33,38)
+          PrologParameterListImpl(PARAMETER_LIST)(38,131)
+            PsiElement(()('(')(38,39)
+            PsiElement(()('(')(48,49)
+            PrologCommonValImpl(COMMON_VAL)(62,69)
+              PrologCommonPredicateImpl(COMMON_PREDICATE)(62,69)
+                PrologRefPredicateIdImpl(REF_PREDICATE_ID)(62,69)
+                  PsiElement(const_id)('maplist')(62,69)
+            PrologEquivBinaryImpl(EQUIV_BINARY)(69,115)
+              PrologLogicalAndImpl(LOGICAL_AND)(69,115)
+                PsiElement(,)(',')(69,70)
+                PrologCommonValImpl(COMMON_VAL)(83,115)
+                  PrologCommonPredicateImpl(COMMON_PREDICATE)(83,115)
+                    PrologRefPredicateIdImpl(REF_PREDICATE_ID)(83,88)
+                      PsiElement(const_id)('debug')(83,88)
+                    PrologParameterListImpl(PARAMETER_LIST)(88,115)
+                      PsiElement(()('(')(88,89)
+                      PrologCommonValImpl(COMMON_VAL)(89,92)
+                        PrologCommonPredicateImpl(COMMON_PREDICATE)(89,92)
+                          PrologRefPredicateIdImpl(REF_PREDICATE_ID)(89,92)
+                            PsiElement(const_id)('ast')(89,92)
+                      PrologEquivBinaryImpl(EQUIV_BINARY)(92,114)
+                        PrologLogicalAndImpl(LOGICAL_AND)(92,114)
+                          PsiElement(,)(',')(92,93)
+                          PrologCommonValImpl(COMMON_VAL)(94,103)
+                            PrologLiteralImpl(LITERAL)(94,103)
+                              PsiElement(string)('"Renamed"')(94,103)
+                          PrologEquivBinaryImpl(EQUIV_BINARY)(103,114)
+                            PrologLogicalAndImpl(LOGICAL_AND)(103,114)
+                              PsiElement(,)(',')(103,104)
+                              PrologCommonValImpl(COMMON_VAL)(105,114)
+                                PrologListConstructorImpl(LIST_CONSTRUCTOR)(105,114)
+                                  PsiElement([)('[')(105,106)
+                                  PrologCommonValImpl(COMMON_VAL)(106,113)
+                                    PrologIdentImpl(IDENT)(106,113)
+                                      PsiElement(atom_id)('Renamed')(106,113)
+                                  PsiElement(])(']')(113,114)
+                      PsiElement())(')')(114,115)
+            PsiElement())(')')(124,125)
+            PsiElement())(')')(130,131)
+  PsiElement(.)('.')(131,132)