diff --git a/flang/test/Lower/OpenACC/pre-fir-tree01.f90 b/flang/test/Lower/OpenACC/pre-fir-tree01.f90
new file mode 100644
index 0000000000000..b1b4205856dbc
--- /dev/null
+++ b/flang/test/Lower/OpenACC/pre-fir-tree01.f90
@@ -0,0 +1,18 @@
+! RUN: bbc -fopenacc -pft-test -o %t %s | FileCheck %s
+! RUN: %flang_fc1 -fopenacc -fdebug-dump-pft -o %t %s | FileCheck %s
+
+! Test structure of the Pre-FIR tree with OpenACC
+
+subroutine sub1(a, b, n)
+  real :: a(:), b(:)
+  integer :: n, i
+  !$acc parallel loop present(a, b)
+  do i = 1, n
+    b(i) = exp(a(i))
+  end do
+end subroutine
+
+! CHECK-LABEL: Subroutine sub1
+! CHECK:       <<OpenACCConstruct>>
+! CHECK:       <<DoConstruct>>
+! CHECK:       <<End OpenACCConstruct>>
diff --git a/flang/tools/bbc/bbc.cpp b/flang/tools/bbc/bbc.cpp
index a4a77855c2796..81ab7895c4a4a 100644
--- a/flang/tools/bbc/bbc.cpp
+++ b/flang/tools/bbc/bbc.cpp
@@ -84,6 +84,10 @@ static llvm::cl::opt<bool> enableOpenMP("fopenmp",
                                         llvm::cl::desc("enable openmp"),
                                         llvm::cl::init(false));
 
+static llvm::cl::opt<bool> enableOpenACC("fopenacc",
+                                         llvm::cl::desc("enable openacc"),
+                                         llvm::cl::init(false));
+
 #define FLANG_EXCLUDE_CODEGEN
 #include "flang/Tools/CLOptions.inc"
 
@@ -251,6 +255,12 @@ int main(int argc, char **argv) {
     options.predefinitions.emplace_back("_OPENMP", "201511");
   }
 
+  // enable parsing of OpenACC
+  if (enableOpenACC) {
+    options.features.Enable(Fortran::common::LanguageFeature::OpenACC);
+    options.predefinitions.emplace_back("_OPENACC", "201911");
+  }
+
   Fortran::common::IntrinsicTypeDefaultKinds defaultKinds;
   Fortran::parser::AllSources allSources;
   Fortran::parser::AllCookedSources allCookedSources(allSources);