diff --git a/Changes b/Changes
index 215f5493a..90710cf90 100644
--- a/Changes
+++ b/Changes
@@ -5,6 +5,9 @@ indicates the contributor was also the author of the fix; Thanks!
 
 * Verilator 3.6***
 
+**   SystemC uint64_t pins are now the default instead of sc_bv<64>.
+     Use --no-pins64 for backward compatibility.
+
 ***  Support SystemVerilog "cover property" statements.
 
 ***  When warnings are disabled on signals that are flattened out, disable
diff --git a/bin/verilator b/bin/verilator
index 314cfd21e..851768555 100755
--- a/bin/verilator
+++ b/bin/verilator
@@ -202,13 +202,13 @@ descriptions in the next sections for more information.
     --MP                        Create phony dependency targets
     --Mdir <directory>          Name of output object directory
     --mod-prefix <topname>      Name to prepend to lower classes
+    --no-pins64                 Don't use uint64_t's for 33-64 bit sigs
     --no-skip-identical         Disable skipping identical output
     -O0                         Disable optimizations
     -O3                         High performance optimizations
     -O<optimization-letter>     Selectable optimizations
     --output-split <bytes>      Split .cpp files into pieces
     --output-split-cfuncs <statements>   Split .ccp functions
-    --pins64                    Use uint64_t's for 33-64 bit sigs
     --prefix <topname>          Name of top level class
     --profile-cfuncs            Name functions for profiling
     --private                   Debugging; see docs
@@ -413,6 +413,12 @@ be placed in this directory.  If not specified, "obj_dir" is used.
 Specifies the name to prepend to all lower level classes.  Defaults to
 the same as --prefix.
 
+=item --no-pins64
+
+Specifies SystemC outputs of 33-64 bits wide should use sc_bv's instead of
+uint64_t's.  Uint64's are faster, but sc_bvs were the default until
+Verilator 3.671.
+
 =item --no-skip-identical
 
 Rarely needed.  Disables skipping execution of Verilator if all source
@@ -454,11 +460,6 @@ operations, a new function will be created.  With --output-split, this will
 enable GCC to compile faster, at a small loss in performance that increases
 with smaller statement values.
 
-=item --pins64
-
-Specifies SystemC outputs of 33-64 bits wide should use uint64_t instead of
-the backward-compatible default of sc_bv's.
-
 =item --prefix I<topname>
 
 Specifies the name of the top level class and makefile.  Defaults to V
@@ -977,7 +978,7 @@ following type conversions: Pins of a single bit become bool, unless they
 are marked with `systemc_clock, in which case they become sc_clock's (for
 SystemC 1.2, not needed in SystemC 2.0).  Pins 2-32 bits wide become
 uint32_t's.  Pins 33-64 bits wide become sc_bv's or uint64_t's depending on
-the -pins64 switch.  Wider pins become sc_bv's.
+the --no-pins64 switch.  Wider pins become sc_bv's.
 
 Lower modules are not pure SystemC code.  This is a feature, as using the
 SystemC pin interconnect scheme everywhere would reduce performance by an
diff --git a/src/V3Options.cpp b/src/V3Options.cpp
index 981a903a0..51bfea67a 100644
--- a/src/V3Options.cpp
+++ b/src/V3Options.cpp
@@ -833,7 +833,7 @@ V3Options::V3Options() {
     m_makeDepend = true;
     m_makePhony = false;
     m_outFormatOk = false;
-    m_pins64 = false;
+    m_pins64 = true;
     m_profileCFuncs = false;
     m_preprocOnly = false;
     m_psl = false;
diff --git a/test_sp/sc_main.cpp b/test_sp/sc_main.cpp
index 1ecfdb578..fe8b81901 100644
--- a/test_sp/sc_main.cpp
+++ b/test_sp/sc_main.cpp
@@ -51,10 +51,10 @@ int sc_main(int argc, char* argv[]) {
     sc_signal<bool> reset_l;
     sc_signal<bool> passed;
     sc_signal<uint32_t> in_small;
-    sc_signal<sc_bv<40> > in_quad;
+    sc_signal<uint64_t> in_quad;
     sc_signal<sc_bv<70> > in_wide;
     sc_signal<uint32_t> out_small;
-    sc_signal<sc_bv<40> > out_quad;
+    sc_signal<uint64_t> out_quad;
     sc_signal<sc_bv<70> > out_wide;
 
     //==========