diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index dce6465e..aac538ee 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -230,7 +230,7 @@ jobs:
         run: make -C sources -j 4 ${{ matrix.bin }}
 
       - name: Test
-        run: ./check/check.rb ./sources/${{ matrix.bin }} --stat --timeout 30 ${{ matrix.nthreads && format('-w{0}', matrix.nthreads) || '' }}
+        run: ./check/check.rb ./sources/${{ matrix.bin }} --stat --timeout 30 ${{ matrix.nthreads && format('-w{0}', matrix.nthreads) || '' }} --fake-valgrind
 
       - name: Generate LCOV coverage data
         run: |
diff --git a/check/check.rb b/check/check.rb
index 2d082a3c..7084f438 100755
--- a/check/check.rb
+++ b/check/check.rb
@@ -266,7 +266,11 @@ def mpi?
   end
 
   def valgrind?
-    !FormTest.cfg.valgrind.nil?
+    if FormTest.cfg.fake_valgrind.nil?
+      !FormTest.cfg.valgrind.nil?
+    else
+      FormTest.cfg.fake_valgrind
+    end
   end
 
   def wordsize
@@ -1147,12 +1151,13 @@ def delete(classname)
 
 # FORM configuration.
 class FormConfig
-  def initialize(form, mpirun, mpirun_opts, valgrind, valgrind_opts, wordsize, ncpu, timeout, retries, stat, full, verbose, show_newlines)
+  def initialize(form, mpirun, mpirun_opts, valgrind, valgrind_opts, fake_valgrind, wordsize, ncpu, timeout, retries, stat, full, verbose, show_newlines)
     @form     = form
     @mpirun   = mpirun
     @mpirun_opts = mpirun_opts
     @valgrind = valgrind
     @valgrind_opts = valgrind_opts
+    @fake_valgrind = fake_valgrind
     @ncpu     = ncpu
     @timeout  = timeout
     @retries  = retries
@@ -1174,7 +1179,7 @@ def initialize(form, mpirun, mpirun_opts, valgrind, valgrind_opts, wordsize, ncp
     @form_cmd    = nil
   end
 
-  attr_reader :form, :mpirun, :mpirun_opts, :valgrind, :valgrind_opts, :ncpu, :timeout, :retries, :stat, :full, :verbose, :show_newlines,
+  attr_reader :form, :mpirun, :mpirun_opts, :valgrind, :valgrind_opts, :fake_valgrind, :ncpu, :timeout, :retries, :stat, :full, :verbose, :show_newlines,
               :form_bin, :mpirun_bin, :valgrind_bin, :valgrind_supp, :head, :wordsize, :form_cmd
 
   def serial?
@@ -1446,6 +1451,7 @@ def main
   opts.enable_valgrind = false
   opts.valgrind = "valgrind"
   opts.valgrind_opts = nil
+  opts.fake_valgrind = nil
   opts.wordsize = nil
   opts.dir = nil
   opts.name_patterns = []
@@ -1482,6 +1488,10 @@ def main
             "Full test, ignoring pending")        { opts.full = true }
   parser.on("--enable-valgrind",
             "Enable Valgrind")                    { opts.enable_valgrind = true }
+  parser.on("--fake-valgrind",
+            "Pretend to run under Valgrind")      { opts.fake_valgrind = true }
+  parser.on("--fake-no-valgrind",
+            "Pretend not to run under Valgrind")  { opts.fake_valgrind = false }
   parser.on("--valgrind BIN",
             "Use BIN as Valgrind executable")     { |bin| opts.enable_valgrind = true; opts.valgrind = bin }
   parser.on("--valgrind-opts OPTS",
@@ -1624,6 +1634,7 @@ def main
                                 opts.mpirun_opts,
                                 opts.enable_valgrind ? opts.valgrind : nil,
                                 opts.valgrind_opts,
+                                opts.fake_valgrind,
                                 opts.wordsize,
                                 opts.ncpu,
                                 [opts.timeout, 1].max,