diff --git a/libs/ardour/wscript b/libs/ardour/wscript
index a23657c49d..8d8cb5bf0e 100644
--- a/libs/ardour/wscript
+++ b/libs/ardour/wscript
@@ -488,7 +488,7 @@ def build(bld):
             # usability of the 64 bit windows assembler depends on the compiler target,
             # not the build host, which in turn can only be inferred from the name
             # of the compiler.
-            if re.search ('x86_64-w64', bld.env['CC']):
+            if re.search ('x86_64-w64', str(bld.env['CC'])):
                 obj.source += [ 'sse_functions_xmm.cc' ]
                 obj.source += [ 'sse_functions_64bit_win.s',  'sse_avx_functions_64bit_win.s' ]
                 avx_sources = [ 'sse_functions_avx.cc' ]
diff --git a/libs/evoral/wscript b/libs/evoral/wscript
index feef41f2ff..0f8e10b88d 100644
--- a/libs/evoral/wscript
+++ b/libs/evoral/wscript
@@ -35,7 +35,7 @@ def configure(conf):
 
     if Options.options.internal_shared_libs:
         conf.define('INTERNAL_SHARED_LIBS', 1)
-    #autowaf.display_msg(conf, "Unit tests", conf.env['BUILD_TESTS'])
+    #autowaf.display_msg(conf, "Unit tests", str(conf.env['BUILD_TESTS']))
     #print
 
 def build(bld):
diff --git a/wscript b/wscript
index b64efdb391..3db6ebf626 100644
--- a/wscript
+++ b/wscript
@@ -519,7 +519,7 @@ int main() { return 0; }''',
         if conf.env['build_target'] == 'armhf' or conf.env['build_target'] == 'aarch64':
             conf.define('ARM_NEON_SUPPORT', 1)
         elif conf.env['build_target'] == 'mingw':
-            if re.search ('x86_64-w64', conf.env['CC']) is not None:
+            if re.search ('x86_64-w64', str(conf.env['CC'])) is not None:
                 conf.define ('FPU_AVX_FMA_SUPPORT', 1)
                 conf.define ('FPU_AVX512F_SUPPORT', 1)
         elif conf.env['build_target'] == 'i386' or conf.env['build_target'] == 'i686' or conf.env['build_target'] == 'x86_64':
@@ -635,7 +635,7 @@ int main() { return 0; }''',
             # usability of the 64 bit windows assembler depends on the compiler target,
             # not the build host, which in turn can only be inferred from the name
             # of the compiler.
-            if re.search ('x86_64-w64', conf.env['CC']) is not None:
+            if re.search ('x86_64-w64', str(conf.env['CC'])) is not None:
                     compiler_flags.append ("-DBUILD_SSE_OPTIMIZATIONS")
         if not build_host_supports_sse:
             print("\nWarning: you are building Ardour with SSE support even though your system does not support these instructions. (This may not be an error, especially if you are a package maintainer)")