diff --git a/src/db/db/dbNetlistSpiceReader.cc b/src/db/db/dbNetlistSpiceReader.cc
index af72199e5..269a85bb5 100644
--- a/src/db/db/dbNetlistSpiceReader.cc
+++ b/src/db/db/dbNetlistSpiceReader.cc
@@ -419,7 +419,10 @@ bool NetlistSpiceReader::read_card ()
 
       while (! ex.at_end ()) {
         std::string n = read_name (ex);
-        m_global_nets.push_back (n);
+        if (m_global_net_names.find (n) == m_global_net_names.end ()) {
+          m_global_nets.push_back (n);
+          m_global_net_names.insert (n);
+        }
       }
 
     } else if (ex.test_without_case ("subckt")) {
diff --git a/src/db/db/dbNetlistSpiceReader.h b/src/db/db/dbNetlistSpiceReader.h
index fd1de5e26..088400258 100644
--- a/src/db/db/dbNetlistSpiceReader.h
+++ b/src/db/db/dbNetlistSpiceReader.h
@@ -131,6 +131,7 @@ private:
   std::string m_stored_line;
   std::map<std::string, bool> m_captured;
   std::vector<std::string> m_global_nets;
+  std::set<std::string> m_global_net_names;
   std::set<const db::Circuit *> m_circuits_read;
 
   void push_stream (const std::string &path);
diff --git a/src/db/unit_tests/dbNetlistReaderTests.cc b/src/db/unit_tests/dbNetlistReaderTests.cc
index 8c6f29de0..75ff3bf80 100644
--- a/src/db/unit_tests/dbNetlistReaderTests.cc
+++ b/src/db/unit_tests/dbNetlistReaderTests.cc
@@ -422,3 +422,24 @@ TEST(11_ErrorOnCircuitRedefinition)
   EXPECT_EQ (tl::replaced (msg, path, "?"), "Redefinition of circuit SUBCKT in ?, line 20");
 }
 
+TEST(12_IgnoreDuplicateGlobals)
+{
+  db::Netlist nl;
+
+  std::string path = tl::combine_path (tl::combine_path (tl::combine_path (tl::testsrc (), "testdata"), "algo"), "nreader12.cir");
+
+  db::NetlistSpiceReader reader;
+  tl::InputStream is (path);
+  reader.read (is, nl);
+
+  EXPECT_EQ (nl.to_string (),
+    "circuit .TOP ();\n"
+    "  device RES $1 (A=VDD,B=GND) (R=1000,L=0,W=0,A=0,P=0);\n"
+    "  subcircuit FILLER_CAP '0' (VDD=VDD,GND=GND);\n"
+    "end;\n"
+    "circuit FILLER_CAP (VDD=VDD,GND=GND);\n"
+    "  device NMOS '0' (S=GND,G=VDD,D=GND,B=GND) (L=10,W=10,AS=0,AD=0,PS=0,PD=0);\n"
+    "end;\n"
+  );
+}
+
diff --git a/testdata/algo/nreader12.cir b/testdata/algo/nreader12.cir
new file mode 100644
index 000000000..86a72691d
--- /dev/null
+++ b/testdata/algo/nreader12.cir
@@ -0,0 +1,14 @@
+
+.global vdd gnd
+
+X0 FILLER_CAP
+R$1 vdd gnd 1k
+
+* should be ignored:
+.global vdd 
+.global gnd 
+
+.subckt FILLER_CAP
+M0 gnd vdd gnd gnd NMOS W=10u L=10u
+.ends FILLER_CAP
+