diff --git a/bin/regression-wally b/bin/regression-wally
index 5baf73f0f..ccbc249f9 100755
--- a/bin/regression-wally
+++ b/bin/regression-wally
@@ -292,7 +292,10 @@ def addTests(tests, sim):
 
 def addLockstepTestsByDir(dir, config, sim):
     sim_logdir = WALLY+ "/sim/" + sim + "/logs/"
-    cmdPrefix="wsim --lockstep --sim " + sim + " " + coverStr + " " + config
+    if (coverStr != ""): # use --fcov in place of --lockstep
+        cmdPrefix="wsim --sim " + sim + " " + coverStr + " " + config
+    else:
+        cmdPrefix="wsim --lockstep --sim " + sim + " " + config
     if (os.path.isdir(dir)): 
         for dirpath, dirnames, filenames in os.walk(os.path.abspath(dir)):
             for file in filenames:
diff --git a/config/rv32gc/coverage_extensions.svh b/config/rv32gc/coverage.svh
similarity index 82%
rename from config/rv32gc/coverage_extensions.svh
rename to config/rv32gc/coverage.svh
index 80f73c6f4..d40d78ea2 100644
--- a/config/rv32gc/coverage_extensions.svh
+++ b/config/rv32gc/coverage.svh
@@ -1,4 +1,4 @@
-// coverage_extensions.svh
+// coverage.svh
 // David_Harris@hmc.edu 7 September 2024
 // SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
 
@@ -7,5 +7,7 @@
 
 `define COVER_RV32I
 `define COVER_RV32M
+`define COVER_RV32F
 `include "coverage/RV32I_coverage.svh"
 `include "coverage/RV32M_coverage.svh"
+`include "coverage/RV32F_coverage.svh"
diff --git a/config/rv64gc/coverage.svh b/config/rv64gc/coverage.svh
new file mode 100644
index 000000000..ee811e922
--- /dev/null
+++ b/config/rv64gc/coverage.svh
@@ -0,0 +1,13 @@
+// coverage.svh
+// David_Harris@hmc.edu 7 September 2024
+// SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
+
+// This file is needed in the config subdirectory for each config supporting coverage.
+// It defines which extensions are enabled for that config.
+
+`define COVER_RV64I
+`define COVER_RV64M
+`define COVER_RV64F
+`include "coverage/RV64I_coverage.svh"
+`include "coverage/RV64M_coverage.svh"
+`include "coverage/RV64F_coverage.svh"