diff --git a/spec/mnemosyne/probes/redis-client/command_spec.rb b/spec/mnemosyne/probes/redis-client/command_spec.rb
index c08c8c0..13f593e 100644
--- a/spec/mnemosyne/probes/redis-client/command_spec.rb
+++ b/spec/mnemosyne/probes/redis-client/command_spec.rb
@@ -29,19 +29,19 @@
     trace.span[0].tap do |span|
       expect(span.name).to eq 'db.query.redis'
       expect(span.meta[:commands]).to eq 'HELLO ?'
-      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379'
     end
 
     trace.span[1].tap do |span|
       expect(span.name).to eq 'db.query.redis'
       expect(span.meta[:commands]).to eq 'SET mykey ?'
-      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379'
     end
 
     trace.span[2].tap do |span|
       expect(span.name).to eq 'db.query.redis'
       expect(span.meta[:commands]).to eq 'GET mykey'
-      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379'
     end
   end
 
@@ -60,14 +60,14 @@
     trace.span[0].tap do |span|
       expect(span.name).to eq 'db.query.redis'
       expect(span.meta[:commands]).to eq 'HELLO ?'
-      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379'
     end
 
     trace.span[1].tap do |span|
       expect(span.name).to eq 'db.query.redis'
       expect(span.meta[:commands]).to eq "SET foo ?\nSET baz ?"
       expect(span.meta[:pipelined]).to eq true
-      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379'
     end
   end
 
@@ -83,14 +83,14 @@
     trace.span[0].tap do |span|
       expect(span.name).to eq 'db.query.redis'
       expect(span.meta[:commands]).to eq 'HELLO ?'
-      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379'
     end
 
     trace.span[1].tap do |span|
       expect(span.name).to eq 'db.query.redis'
       expect(span.meta[:commands]).to eq 'UNKNOWN_FUNCTION ?'
       expect(span.meta[:error]).to start_with 'ERR unknown command'
-      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+      expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379'
     end
   end
 end
diff --git a/spec/mnemosyne/probes/redis/command_spec.rb b/spec/mnemosyne/probes/redis/command_spec.rb
index 9b076bc..94c0550 100644
--- a/spec/mnemosyne/probes/redis/command_spec.rb
+++ b/spec/mnemosyne/probes/redis/command_spec.rb
@@ -27,12 +27,12 @@
     span = trace.span[0]
     expect(span.name).to eq 'db.query.redis'
     expect(span.meta[:commands]).to eq 'SET mykey ?'
-    expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+    expect(span.meta[:server]).to match %r{^redis://127.0.0.1:16379(/0)?$}
 
     span = trace.span[1]
     expect(span.name).to eq 'db.query.redis'
     expect(span.meta[:commands]).to eq 'GET mykey'
-    expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+    expect(span.meta[:server]).to match %r{^redis://127.0.0.1:16379(/0)?$}
   end
 
   it 'creates just one span for pipelined (parallel) commands' do
@@ -51,7 +51,7 @@
     expect(span.name).to eq 'db.query.redis'
     expect(span.meta[:commands]).to eq "SET foo ?\nSET baz ?"
     expect(span.meta[:pipelined]).to eq true
-    expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+    expect(span.meta[:server]).to match %r{^redis://127.0.0.1:16379(/0)?$}
   end
 
   it 'traces queued commands (also run in parallel when committing)' do
@@ -74,7 +74,7 @@
     expect(span.name).to eq 'db.query.redis'
     expect(span.meta[:commands]).to eq "SET mykey ?\nSET foo ?"
     expect(span.meta[:pipelined]).to eq true
-    expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+    expect(span.meta[:server]).to match %r{^redis://127.0.0.1:16379(/0)?$}
   end
 
   it 'traces commands queued with array syntax' do
@@ -97,7 +97,7 @@
     expect(span.name).to eq 'db.query.redis'
     expect(span.meta[:commands]).to eq "SET mykey ?\nSET foo ?"
     expect(span.meta[:pipelined]).to eq true
-    expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+    expect(span.meta[:server]).to match %r{^redis://127.0.0.1:16379(/0)?$}
   end
 
   it 'attaches errors to the span' do
@@ -113,6 +113,6 @@
     expect(span.name).to eq 'db.query.redis'
     expect(span.meta[:commands]).to eq 'UNKNOWN_FUNCTION ?'
     expect(span.meta[:error]).to start_with 'ERR unknown command'
-    expect(span.meta[:server]).to eq 'redis://127.0.0.1:16379/0'
+    expect(span.meta[:server]).to match %r{^redis://127.0.0.1:16379(/0)?$}
   end
 end