diff --git a/src/particles/pusher/BeamParticleAdvance.cpp b/src/particles/pusher/BeamParticleAdvance.cpp
index fb18f482ce..aae1feb0a6 100644
--- a/src/particles/pusher/BeamParticleAdvance.cpp
+++ b/src/particles/pusher/BeamParticleAdvance.cpp
@@ -172,9 +172,9 @@ AdvanceBeamParticlesSlice (BeamParticleContainer& beam, const Fields& fields,
 
                 // use intermediate fields to calculate next (n+1) transverse momenta
                 const amrex::ParticleReal ux_next = ux + dt * charge_mass_ratio
-                    * ( ExmByp + ( clight - uz * gammap_inv ) * Byp );
+                    * ( ExmByp + ( clight - uz * gammap_inv ) * Byp + uy*gammap_inv*Bzp);
                 const amrex::ParticleReal uy_next = uy + dt * charge_mass_ratio
-                    * ( EypBxp + ( uz * gammap_inv - clight ) * Bxp );
+                    * ( EypBxp + ( uz * gammap_inv - clight ) * Bxp - ux*gammap_inv*Bzp);
 
                 // Now computing new longitudinal momentum
                 const amrex::ParticleReal ux_intermediate = ( ux_next + ux ) * 0.5_rt;
diff --git a/tests/checksum/benchmarks_json/adaptive_time_step.1Rank.json b/tests/checksum/benchmarks_json/adaptive_time_step.1Rank.json
index 71339a415a..b9e6000215 100644
--- a/tests/checksum/benchmarks_json/adaptive_time_step.1Rank.json
+++ b/tests/checksum/benchmarks_json/adaptive_time_step.1Rank.json
@@ -2,18 +2,18 @@
   "lev=0": {
     "Bx": 3238.6172166428,
     "By": 3238.6172166428,
-    "Bz": 1.556879883973e-07,
+    "Bz": 1.5568798839709e-07,
     "ExmBy": 0.0,
     "EypBx": 0.0,
-    "Ez": 1.8570346400715e-05,
+    "Ez": 1.8570346400716e-05,
     "Psi": 0.0,
     "Sx": 8186.992902618,
     "Sy": 8186.992902618,
     "chi": 0.0,
-    "jx": 3.1502487470463e-05,
-    "jx_beam": 3.1502487470463e-05,
-    "jy": 3.1502487470463e-05,
-    "jy_beam": 3.1502487470463e-05,
+    "jx": 3.1502487470462e-05,
+    "jx_beam": 3.1502487470462e-05,
+    "jy": 3.1502487470462e-05,
+    "jy_beam": 3.1502487470462e-05,
     "jz_beam": 6455.9967596791,
     "rhomjz": 0.0
   },
@@ -24,8 +24,8 @@
     "x": 43910.016154202,
     "y": 43910.016154202,
     "z": 103295.90024655,
-    "ux": 0.52324418996684,
-    "uy": 0.52324418996684,
+    "ux": 0.52324418996683,
+    "uy": 0.52324418996683,
     "uz": 103296048.58148,
     "w": 6456.0
   }
diff --git a/tests/checksum/benchmarks_json/ionization.2Rank.json b/tests/checksum/benchmarks_json/ionization.2Rank.json
index 43d6b4a605..2a0dd0fcc3 100644
--- a/tests/checksum/benchmarks_json/ionization.2Rank.json
+++ b/tests/checksum/benchmarks_json/ionization.2Rank.json
@@ -1,32 +1,32 @@
 {
   "lev=0": {
-    "Bx": 2689634.1701211,
-    "By": 2671452.5339732,
-    "Bz": 419499.57920538,
-    "ExmBy": 1614988840098500.0,
-    "EypBx": 1595251829176400.0,
-    "Ez": 655267143631080.0,
-    "Psi": 10659250329.435,
-    "Sx": 7.6801881446419e+17,
-    "Sy": 7.6348233522278e+17,
-    "chi": 2086501751035400.0,
-    "jx": 5.1044497606322e+17,
-    "jx_beam": 215269401762800.0,
-    "jy": 5.2149835863969e+17,
-    "jy_beam": 215265762161610.0,
-    "jz_beam": 1.6907146636311e+17,
-    "rhomjz": 9034075714.9063
+    "Bx": 2689634.2223404,
+    "By": 2671452.3497875,
+    "Bz": 419498.97165975,
+    "ExmBy": 1614989148520300.0,
+    "EypBx": 1595251990768200.0,
+    "Ez": 655267124092800.0,
+    "Psi": 10659251571.635,
+    "Sx": 7.6801785965266e+17,
+    "Sy": 7.6348178542711e+17,
+    "chi": 2086501774975900.0,
+    "jx": 5.1044479556346e+17,
+    "jx_beam": 215269231084950.0,
+    "jy": 5.2149802784797e+17,
+    "jy_beam": 215266315701000.0,
+    "jz_beam": 1.6907146636335e+17,
+    "rhomjz": 9034071533.0881
   },
   "beam": {
     "charge": 1.127932350336e-16,
     "id": 248160,
     "mass": 6.413006125856e-28,
-    "x": 0.0002447464565948,
-    "y": 0.00024424132449348,
-    "z": 0.014359627327001,
-    "ux": 2953.6512428163,
-    "uy": 2958.4626626614,
-    "uz": 1386888.171785,
+    "x": 0.0002447472090224,
+    "y": 0.00024424259795952,
+    "z": 0.014359627327289,
+    "ux": 2953.6513634741,
+    "uy": 2958.4623387526,
+    "uz": 1386888.1720874,
     "w": 825000000.0
   }
 }
diff --git a/tests/checksum/benchmarks_json/production.SI.2Rank_pwfa.json b/tests/checksum/benchmarks_json/production.SI.2Rank_pwfa.json
index db63c06bcd..166c7a906b 100644
--- a/tests/checksum/benchmarks_json/production.SI.2Rank_pwfa.json
+++ b/tests/checksum/benchmarks_json/production.SI.2Rank_pwfa.json
@@ -1,44 +1,44 @@
 {
   "lev=0": {
-    "Bx": 0.022061120888569,
-    "By": 8975.2617543366,
-    "Bz": 0.031347907268044,
-    "ExmBy": 3101167123509.8,
-    "EypBx": 8140345.8483614,
-    "Ez": 2413402895305.4,
-    "Psi": 119968842.20863,
-    "Sx": 77263810795965.0,
-    "Sy": 126524085.25783,
-    "chi": 4383226808561.0,
-    "jx": 160567306286450.0,
-    "jx_beam": 160965885403.03,
-    "jy": 1020466184.8443,
-    "jy_beam": 89885.987825344,
-    "jz_beam": 483599930174930.0,
-    "rhomjz": 2214667.3800934
+    "Bx": 0.02206113412832,
+    "By": 8975.2617603234,
+    "Bz": 0.031347911731574,
+    "ExmBy": 3101167125023.1,
+    "EypBx": 8140345.8781593,
+    "Ez": 2413402893798.8,
+    "Psi": 119968842.1441,
+    "Sx": 77263811082688.0,
+    "Sy": 126526644.36943,
+    "chi": 4383226808592.1,
+    "jx": 160567306260430.0,
+    "jx_beam": 160965883855.23,
+    "jy": 1020466990.0208,
+    "jy_beam": 89923.839252715,
+    "jz_beam": 483599928874210.0,
+    "rhomjz": 2214667.3720966
   },
   "driver": {
     "charge": 1.602176634e-13,
     "id": 499935519084,
     "mass": 9.1093837015e-25,
-    "x": 3.1385115751054,
-    "y": 3.1239795539825,
-    "z": 23.933624693334,
-    "ux": 1034932.9216195,
-    "uy": 1033344.8579317,
-    "uz": 983497452.683,
+    "x": 3.1385117654662,
+    "y": 3.1239797597931,
+    "z": 23.933624693298,
+    "ux": 1034932.8383917,
+    "uy": 1033344.7668538,
+    "uz": 983497452.68736,
     "w": 3744396137.536
   },
   "witness": {
     "charge": 1.602176634e-13,
     "id": 750000500000,
     "mass": 9.1093837015e-25,
-    "x": 2.4520422159035,
-    "y": 2.4577218239084,
-    "z": 160.00761694789,
-    "ux": 1127622.0966788,
-    "uy": 1132127.4166013,
-    "uz": 1032541147.5592,
+    "x": 2.4520419409964,
+    "y": 2.4577216202365,
+    "z": 160.00761694795,
+    "ux": 1127622.2288566,
+    "uy": 1132127.5121846,
+    "uz": 1032541147.5503,
     "w": 1248301814.8922
   }
 }