diff --git a/src/spectrum/examples/adhoc-aloha-ideal-phy-with-microwave-oven.cc b/src/spectrum/examples/adhoc-aloha-ideal-phy-with-microwave-oven.cc
index aba1f2590..d1d7a4546 100644
--- a/src/spectrum/examples/adhoc-aloha-ideal-phy-with-microwave-oven.cc
+++ b/src/spectrum/examples/adhoc-aloha-ideal-phy-with-microwave-oven.cc
@@ -255,7 +255,7 @@ main(int argc, char** argv)
 
     SpectrumAnalyzerHelper spectrumAnalyzerHelper;
     spectrumAnalyzerHelper.SetChannel(channel);
-    spectrumAnalyzerHelper.SetRxSpectrumModel(SpectrumModelIsm2400MhzRes1Mhz);
+    spectrumAnalyzerHelper.SetRxSpectrumModel(SpectrumModelIsm2400MhzRes1Mhz());
     spectrumAnalyzerHelper.SetPhyAttribute("Resolution", TimeValue(MilliSeconds(2)));
     spectrumAnalyzerHelper.SetPhyAttribute("NoisePowerSpectralDensity",
                                            DoubleValue(1e-15)); // -120 dBm/Hz
diff --git a/src/spectrum/model/spectrum-model-300kHz-300GHz-log.cc b/src/spectrum/model/spectrum-model-300kHz-300GHz-log.cc
index 1b44e96cc..00f24234a 100644
--- a/src/spectrum/model/spectrum-model-300kHz-300GHz-log.cc
+++ b/src/spectrum/model/spectrum-model-300kHz-300GHz-log.cc
@@ -13,35 +13,18 @@ namespace ns3
 
 /**
  * @ingroup spectrum
- * Spectrum model logger for frequencies between 300 Khz 300 Ghz
+ * Spectrum model logger for frequencies between 300 KHz 300 GHz
  */
-Ptr<SpectrumModel> SpectrumModel300Khz300GhzLog;
-
-/**
- * @ingroup spectrum
- *
- * Static initializer class for Spectrum model logger
- * for frequencies between 300 Khz 300 Ghz
- */
-class static_SpectrumModel300Khz300GhzLog_initializer
+Ptr<SpectrumModel>
+SpectrumModel300Khz300GhzLog()
 {
-  public:
-    static_SpectrumModel300Khz300GhzLog_initializer()
+    std::vector<double> freqs;
+    for (double f = 3e5; f < 3e11; f = f * 2)
     {
-        std::vector<double> freqs;
-        for (double f = 3e5; f < 3e11; f = f * 2)
-        {
-            freqs.push_back(f);
-        }
-        SpectrumModel300Khz300GhzLog = Create<SpectrumModel>(freqs);
+        freqs.push_back(f);
     }
-};
-
-/**
- * @ingroup spectrum
- * Static variable for analyzer initialization
- */
-static_SpectrumModel300Khz300GhzLog_initializer
-    g_static_SpectrumModel300Khz300GhzLog_initializer_instance;
+    static Ptr<SpectrumModel> model = Create<SpectrumModel>(freqs);
+    return model;
+}
 
 } // namespace ns3
diff --git a/src/spectrum/model/spectrum-model-300kHz-300GHz-log.h b/src/spectrum/model/spectrum-model-300kHz-300GHz-log.h
index ba55982b7..507ee4143 100644
--- a/src/spectrum/model/spectrum-model-300kHz-300GHz-log.h
+++ b/src/spectrum/model/spectrum-model-300kHz-300GHz-log.h
@@ -14,8 +14,12 @@
 namespace ns3
 {
 
-extern Ptr<SpectrumModel> SpectrumModel300Khz300GhzLog;
+/**
+ * @brief Spectrum model logger for frequencies between 300 KHz 300 GHz
+ * @return Spectrum model with a range of 300 KHz to 300 GHz for center frequencies
+ */
+Ptr<SpectrumModel> SpectrumModel300Khz300GhzLog();
 
-}
+} // namespace ns3
 
 #endif /*  FREQS_300KHZ_300GHZ_LOG_H */
diff --git a/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.cc b/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.cc
index 246ad1f22..c9f3cbcb0 100644
--- a/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.cc
+++ b/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.cc
@@ -16,35 +16,16 @@ namespace ns3
  * Spectrum model logger for frequencies in the 2.4 GHz ISM band
  * with 1 MHz resolution.
  */
-Ptr<SpectrumModel> SpectrumModelIsm2400MhzRes1Mhz;
-
-/**
- * @ingroup spectrum
- *
- * Static initializer class for Spectrum model logger for
- * frequencies in the 2.4 GHz ISM band with 1 MHz resolution.
- */
-class static_SpectrumModelIsm2400MhzRes1Mhz_initializer
+Ptr<SpectrumModel>
+SpectrumModelIsm2400MhzRes1Mhz()
 {
-  public:
-    static_SpectrumModelIsm2400MhzRes1Mhz_initializer()
+    std::vector<double> freqs(100);
+    for (int i = 0; i < 100; ++i)
     {
-        std::vector<double> freqs;
-        freqs.reserve(100);
-        for (int i = 0; i < 100; ++i)
-        {
-            freqs.push_back((i + 2400) * 1e6);
-        }
-
-        SpectrumModelIsm2400MhzRes1Mhz = Create<SpectrumModel>(freqs);
+        freqs[i] = ((i + 2400) * 1e6);
     }
-};
-
-/**
- * @ingroup spectrum
- * Static variable for analyzer initialization
- */
-static_SpectrumModelIsm2400MhzRes1Mhz_initializer
-    g_static_SpectrumModelIsm2400MhzRes1Mhz_initializer_instance;
+    static Ptr<SpectrumModel> model = Create<SpectrumModel>(freqs);
+    return model;
+}
 
 } // namespace ns3
diff --git a/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.h b/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.h
index 5fc2cbfc4..de7bd4855 100644
--- a/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.h
+++ b/src/spectrum/model/spectrum-model-ism2400MHz-res1MHz.h
@@ -14,8 +14,13 @@
 namespace ns3
 {
 
-extern Ptr<SpectrumModel> SpectrumModelIsm2400MhzRes1Mhz;
+/**
+ * @brief Spectrum model logger for frequencies in the 2.4 GHz ISM band
+ * with 1 MHz resolution.
+ * @return Spectrum model for 2.4 GHz ISM band
+ */
+Ptr<SpectrumModel> SpectrumModelIsm2400MhzRes1Mhz();
 
-}
+} // namespace ns3
 
 #endif /* FREQS_ISM2400MHZ_RES1MHZ_H */