diff --git a/src/AMOEBA/amoeba_repulsion.cpp b/src/AMOEBA/amoeba_repulsion.cpp
index 2823a82de2..0342eeb513 100644
--- a/src/AMOEBA/amoeba_repulsion.cpp
+++ b/src/AMOEBA/amoeba_repulsion.cpp
@@ -334,22 +334,20 @@ void PairAmoeba::repulsion()
 
       erepulse += e;
 
-      //fprintf(fp,"REPUL %d %d %15.12g %15.12g\n",atom->tag[i],atom->tag[j],r,e);
-      
       // increment force-based gradient and torque on atom I
 
-      f[i][0] += frcx;
-      f[i][1] += frcy;
-      f[i][2] += frcz;
+      f[i][0] -= frcx;
+      f[i][1] -= frcy;
+      f[i][2] -= frcz;
       tq[i][0] += ttri[0];
       tq[i][1] += ttri[1];
       tq[i][2] += ttri[2];
 
       // increment force-based gradient and torque on atom J
 
-      f[j][0] -= frcx;
-      f[j][1] -= frcy;
-      f[j][2] -= frcz;
+      f[j][0] += frcx;
+      f[j][1] += frcy;
+      f[j][2] += frcz;
       tq[j][0] += ttrk[0];
       tq[j][1] += ttrk[1];
       tq[j][2] += ttrk[2];
diff --git a/src/AMOEBA/amoeba_utils.cpp b/src/AMOEBA/amoeba_utils.cpp
index e5831f9348..422b905949 100644
--- a/src/AMOEBA/amoeba_utils.cpp
+++ b/src/AMOEBA/amoeba_utils.cpp
@@ -1016,8 +1016,8 @@ void PairAmoeba::torque2force(int i, double *trq,
   if (axetyp == ZONLY) {
     for (j = 0; j < 3; j++) {
       du = uv[j]*dphidv/(usiz*uvsin) + uw[j]*dphidw/usiz;
-      f[ia][j] -= du;
-      f[ib][j] += du;
+      f[ia][j] += du;
+      f[ib][j] -= du;
       frcz[j] += du;
     }
 
@@ -1027,9 +1027,9 @@ void PairAmoeba::torque2force(int i, double *trq,
     for (j = 0; j < 3; j++) {
       du = uv[j]*dphidv/(usiz*uvsin) + uw[j]*dphidw/usiz;
       dv = -uv[j]*dphidu/(vsiz*uvsin);
-      f[ia][j] -= du;
-      f[ic][j] -= dv;
-      f[ib][j] += du + dv;
+      f[ia][j] += du;
+      f[ic][j] += dv;
+      f[ib][j] -= du + dv;
       frcz[j] += du;
       frcx[j] += dv;
     }
@@ -1040,9 +1040,9 @@ void PairAmoeba::torque2force(int i, double *trq,
     for (j = 0; j < 3; j++) {
       du = uv[j]*dphidv/(usiz*uvsin) + 0.5*uw[j]*dphidw/usiz;
       dv = -uv[j]*dphidu/(vsiz*uvsin) + 0.5*vw[j]*dphidw/vsiz;
-      f[ia][j] -= du;
-      f[ic][j] -= dv;
-      f[ib][j] += du + dv;
+      f[ia][j] += du;
+      f[ic][j] += dv;
+      f[ib][j] -= du + dv;
       frcz[j] += du;
       frcx[j] += dv;
     }
@@ -1054,10 +1054,10 @@ void PairAmoeba::torque2force(int i, double *trq,
       du = ur[j]*dphidr/(usiz*ursin) + us[j]*dphids/usiz;
       dv = (vssin*s[j]-vscos*t1[j])*dphidu / (vsiz*(ut1sin+ut2sin));
       dw = (wssin*s[j]-wscos*t2[j])*dphidu / (wsiz*(ut1sin+ut2sin));
-      f[ia][j] -= du;
-      f[ic][j] -= dv;
-      f[id][j] -= dw;
-      f[ib][j] += du + dv + dw;
+      f[ia][j] += du;
+      f[ic][j] += dv;
+      f[id][j] += dw;
+      f[ib][j] -= du + dv + dw;
       frcz[j] += du;
       frcx[j] += dv;
       frcy[j] += dw;
@@ -1096,8 +1096,8 @@ void PairAmoeba::torque2force(int i, double *trq,
     eps[2] = del[0]*w[1] - del[1]*w[0];
     for (j = 0; j < 3; j++) {
       dw = del[j]*dphidr/(wsiz*rwsin) + eps[j]*dphiddel*wpcos/(wsiz*psiz);
-      f[id][j] -= dw;
-      f[ib][j] += dw;
+      f[id][j] += dw;
+      f[ib][j] -= dw;
       frcy[j] += dw;
     }
     r[0] = v[0] + w[0];
@@ -1121,8 +1121,8 @@ void PairAmoeba::torque2force(int i, double *trq,
     eps[2] = del[0]*u[1] - del[1]*u[0];
     for (j = 0; j < 3; j++) {
       du = del[j]*dphidr/(usiz*rusin) + eps[j]*dphiddel*upcos/(usiz*psiz);
-      f[ia][j] -= du;
-      f[ib][j] += du;
+      f[ia][j] += du;
+      f[ib][j] -= du;
       frcz[j] += du;
     }
     r[0] = u[0] + w[0];
@@ -1146,8 +1146,8 @@ void PairAmoeba::torque2force(int i, double *trq,
     eps[2] = del[0]*v[1] - del[1]*v[0];
     for (j = 0; j < 3; j++) {
       dv = del[j]*dphidr/(vsiz*rvsin) + eps[j]*dphiddel*vpcos/(vsiz*psiz);
-      f[ic][j] -= dv;
-      f[ib][j] += dv;
+      f[ic][j] += dv;
+      f[ib][j] -= dv;
       frcx[j] += dv;
     }
   }