diff --git a/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java b/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
index 9ed68e43552b7ce3b958de98c89566423418d9c0..b82de79c01890217206976752a5e0c0b5296e125 100644
--- a/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
+++ b/src/main/java/gov/usgs/earthquake/nshmp/gmm/Gmm.java
@@ -1038,6 +1038,20 @@ public enum Gmm {
       NgaEastUsgs_2017.COEFFS_SIGMA_PANEL,
       NgaEastUsgs_2017.CONSTRAINTS),
 
+  /** @see PezeshkEtAl_2018 */
+  NGA_EAST_SEED_PZCT18_1SS(
+      PezeshkEtAl_2018.PZCT18_1SS.class,
+      PezeshkEtAl_2018.PZCT18_1SS.NAME,
+      PezeshkEtAl_2018.COEFFS_1SS,
+      PezeshkEtAl_2018.CONSTRAINTS),
+
+  /** @see PezeshkEtAl_2018 */
+  NGA_EAST_SEED_PZCT18_2ES(
+      PezeshkEtAl_2018.PZCT18_2ES.class,
+      PezeshkEtAl_2018.PZCT18_2ES.NAME,
+      PezeshkEtAl_2018.COEFFS_2ES,
+      PezeshkEtAl_2018.CONSTRAINTS),
+
   /** @see NgaEastUsgs_2017 */
   NGA_EAST_SEED_SP15(
       NgaEastUsgs_2017.Seed_SP15.class,
@@ -1059,20 +1073,6 @@ public enum Gmm {
       NgaEastUsgs_2017.COEFFS_SIGMA_PANEL,
       NgaEastUsgs_2017.CONSTRAINTS),
 
-  /** @see PezeshkEtAl_2018 */
-  PZCT18_1SS(
-      PezeshkEtAl_2018.PZCT18_1SS.class,
-      PezeshkEtAl_2018.PZCT18_1SS.NAME,
-      PezeshkEtAl_2018.COEFFS_1SS,
-      PezeshkEtAl_2018.CONSTRAINTS),
-
-  /** @see PezeshkEtAl_2018 */
-  PZCT18_2ES(
-      PezeshkEtAl_2018.PZCT18_2ES.class,
-      PezeshkEtAl_2018.PZCT18_2ES.NAME,
-      PezeshkEtAl_2018.COEFFS_2ES,
-      PezeshkEtAl_2018.CONSTRAINTS),
-
   /* Combined: must be declared after any dependent models above. */
 
   /**
@@ -1542,6 +1542,8 @@ public enum Gmm {
             NGA_EAST_SEED_PEER_GP,
             NGA_EAST_SEED_PZCT15_M1SS,
             NGA_EAST_SEED_PZCT15_M2ES,
+            NGA_EAST_SEED_PZCT18_1SS,
+            NGA_EAST_SEED_PZCT18_2ES,
             NGA_EAST_SEED_SP15,
             NGA_EAST_SEED_SP16,
             NGA_EAST_SEED_YA15));
diff --git a/src/test/java/gov/usgs/earthquake/nshmp/gmm/PezeshkEtAl_2018Tests.java b/src/test/java/gov/usgs/earthquake/nshmp/gmm/PezeshkEtAl_2018Tests.java
index 8476d32fb23ec3ce8f695c97d1fd34d4231ac25f..54d2da31bcecacdaa3fe21a7c3fcd52cd619b11a 100644
--- a/src/test/java/gov/usgs/earthquake/nshmp/gmm/PezeshkEtAl_2018Tests.java
+++ b/src/test/java/gov/usgs/earthquake/nshmp/gmm/PezeshkEtAl_2018Tests.java
@@ -1,7 +1,7 @@
 package gov.usgs.earthquake.nshmp.gmm;
 
-import static gov.usgs.earthquake.nshmp.gmm.Gmm.PZCT18_1SS;
-import static gov.usgs.earthquake.nshmp.gmm.Gmm.PZCT18_2ES;
+import static gov.usgs.earthquake.nshmp.gmm.Gmm.NGA_EAST_SEED_PZCT18_1SS;
+import static gov.usgs.earthquake.nshmp.gmm.Gmm.NGA_EAST_SEED_PZCT18_2ES;
 
 import java.io.IOException;
 import java.util.EnumSet;
@@ -32,8 +32,8 @@ public class PezeshkEtAl_2018Tests implements ArgumentsProvider {
 
   /* Result generation sets */
   private static Set<Gmm> gmms = EnumSet.of(
-      PZCT18_1SS,
-      PZCT18_2ES);
+      NGA_EAST_SEED_PZCT18_1SS,
+      NGA_EAST_SEED_PZCT18_2ES);
 
   private static Set<Imt> imts = PezeshkEtAl_2018.COEFFS_1SS.imts();