diff --git a/.github/workflows/ubuntu.yml b/.github/workflows/ubuntu.yml
index 06eadc7..cf15411 100644
--- a/.github/workflows/ubuntu.yml
+++ b/.github/workflows/ubuntu.yml
@@ -11,6 +11,10 @@ jobs:
     name: GCC DP 2D Profiling
     runs-on: ubuntu-20.04
     if: github.event.pull_request.draft == false
+    env:
+      # FIXME: -Wstringop-overflow
+      #   https://github.com/AMReX-Codes/amrex/pull/2660
+      CXXFLAGS: "-Werror -Wno-error=stringop-overflow"
     steps:
     - uses: actions/checkout@v3
     - uses: actions/checkout@v3
@@ -26,4 +30,5 @@ jobs:
       run: |
         make -j 2             \
           AMREX_HOME=./amrex  \
-          USE_PROFPARSER=TRUE
+          USE_PROFPARSER=TRUE \
+          EXTRACXXFLAGS="${CXXFLAGS}"
diff --git a/Dataset.cpp b/Dataset.cpp
index b406325..b67122d 100644
--- a/Dataset.cpp
+++ b/Dataset.cpp
@@ -29,6 +29,7 @@ const int MAXINDEXCHARS   = 4;
 #include <AMReX_DataServices.H>
 
 #include <sstream>
+#include <string>
 #include <cfloat>
 #include <cmath>
 using std::ostringstream;
@@ -420,7 +421,7 @@ void Dataset::DatasetRender(const Box &alignedRegion, AmrPicture *apptr,
     largestWidth = std::max(8, largestWidth);  // for no data string
   }
 
-  char levelInfo[Amrvis::LINELENGTH], maxInfo[Amrvis::LINELENGTH], minInfo[Amrvis::LINELENGTH];
+  char levelInfo[Amrvis::LINELENGTH];
   char maxInfoV[Amrvis::LINELENGTH],  minInfoV[Amrvis::LINELENGTH];
   sprintf(levelInfo, "Level: %i", maxDrawnLevel);
 
@@ -431,14 +432,16 @@ void Dataset::DatasetRender(const Box &alignedRegion, AmrPicture *apptr,
   XmStringFree(sNewLevel);
   
   sprintf(minInfoV, fstring, rMin);
-  sprintf(minInfo, "Min:%s", minInfoV);
-  XmString sNewMin = XmStringCreateSimple(minInfo);
+  std::string minInfo("Min:");
+  minInfo.append(minInfoV);
+  XmString sNewMin = XmStringCreateSimple(&minInfo[0]);
   XtVaSetValues(wMinValue, XmNlabelString, sNewMin, NULL);
   XmStringFree(sNewMin);
 
   sprintf(maxInfoV, fstring, rMax);
-  sprintf(maxInfo, "Max:%s", maxInfoV);
-  XmString sNewMax = XmStringCreateSimple(maxInfo);
+  std::string maxInfo("Max:");
+  maxInfo.append(maxInfoV);
+  XmString sNewMax = XmStringCreateSimple(&maxInfo[0]);
   XtVaSetValues(wMaxValue, XmNlabelString, sNewMax, NULL);
   XmStringFree(sNewMax);
 
diff --git a/PltApp.cpp b/PltApp.cpp
index 1b1cd4b..51a8b26 100644
--- a/PltApp.cpp
+++ b/PltApp.cpp
@@ -42,6 +42,7 @@
 
 #include <cctype>
 #include <sstream>
+#include <string>
 #include <cmath>
 #include <cstdlib>
 using std::cout;
@@ -2815,7 +2816,6 @@ void PltApp::DoSetRangeButton(Widget, XtPointer, XtPointer) {
     return;
   }
 
-  char range[Amrvis::LINELENGTH];
   char saveRangeString[Amrvis::LINELENGTH];
   char format[Amrvis::LINELENGTH];
   char fMin[Amrvis::LINELENGTH];
@@ -2832,8 +2832,9 @@ void PltApp::DoSetRangeButton(Widget, XtPointer, XtPointer) {
 			 rtMin, rtMax);
   sprintf(fMin, format, rtMin);
   sprintf(fMax, format, rtMax);
-  sprintf(range, "Min: %s  Max: %s", fMin, fMax);
-  strcpy(saveRangeString, range);
+  std::string range("Min: ");
+  range.append(fMin).append("  Max: ").append(fMax);
+  strcpy(saveRangeString, range.c_str());
   
   XtVaGetValues(wAmrVisTopLevel,
 		XmNx, &xpos,
@@ -2964,21 +2965,25 @@ void PltApp::DoSetRangeButton(Widget, XtPointer, XtPointer) {
 			 pltAppState->CurrentDerivedNumber(), rtMin, rtMax);
   sprintf(fMin, format, rtMin);
   sprintf(fMax, format, rtMax);
-  sprintf(range, "Min: %s", fMin);
-  XtVaCreateManagedWidget(range, xmLabelGadgetClass, wRangeRC, NULL);
+  range = "Min: ";
+  range.append(fMin);
+  XtVaCreateManagedWidget(range.c_str(), xmLabelGadgetClass, wRangeRC, NULL);
   //XtVaSetValues(wid, XmNleftOffset, 20, NULL);
-  sprintf(range, "Max: %s", fMax);
-  XtVaCreateManagedWidget(range, xmLabelGadgetClass, wRangeRC, NULL);
+  range = "Max: ";
+  range.append(fMax);
+  XtVaCreateManagedWidget(range.c_str(), xmLabelGadgetClass, wRangeRC, NULL);
 
   pltAppState->GetMinMax(Amrvis::SUBREGIONMINMAX, currentFrame,
 			 pltAppState->CurrentDerivedNumber(),
 			 rtMin, rtMax);
   sprintf(fMin, format, rtMin);
   sprintf(fMax, format, rtMax);
-  sprintf(range, "Min: %s", fMin);
-  XtVaCreateManagedWidget(range, xmLabelGadgetClass, wRangeRC, NULL);
-  sprintf(range, "Max: %s", fMax);
-  XtVaCreateManagedWidget(range, xmLabelGadgetClass, wRangeRC, NULL);
+  range = "Min: ";
+  range.append(fMin);
+  XtVaCreateManagedWidget(range.c_str(), xmLabelGadgetClass, wRangeRC, NULL);
+  range = "Max: ";
+  range.append(fMax);
+  XtVaCreateManagedWidget(range.c_str(), xmLabelGadgetClass, wRangeRC, NULL);
 
   pltAppState->GetMinMax(Amrvis::USERMINMAX, currentFrame,
 			 pltAppState->CurrentDerivedNumber(),
@@ -2990,12 +2995,13 @@ void PltApp::DoSetRangeButton(Widget, XtPointer, XtPointer) {
 			    NULL);
   XtVaCreateManagedWidget("Min:", xmLabelGadgetClass, wid, NULL);
   //XtVaSetValues(wid, XmNmarginWidth, 0, NULL);
-  sprintf(range, format, rtMin);
+  char rangec[Amrvis::LINELENGTH];
+  sprintf(rangec, format, rtMin);
   wUserMin = XtVaCreateManagedWidget("local range",
 			    xmTextFieldWidgetClass, wid,
-			    XmNvalue,		range,
+			    XmNvalue,		rangec,
 			    XmNeditable,	true,
-			    XmNcolumns,		strlen(range)+2,
+			    XmNcolumns,		strlen(rangec)+2,
 			    NULL);
   AddStaticCallback(wUserMin, XmNactivateCallback, &PltApp::DoUserMin);
   
@@ -3005,12 +3011,12 @@ void PltApp::DoSetRangeButton(Widget, XtPointer, XtPointer) {
 			    //XmNborderWidth,      0,
 			    NULL);
   XtVaCreateManagedWidget("Max:", xmLabelGadgetClass, wid, NULL);
-  sprintf(range, format, rtMax);
+  sprintf(rangec, format, rtMax);
   wUserMax = XtVaCreateManagedWidget("local range",
 			    xmTextFieldWidgetClass, wid,
-			    XmNvalue,		range,
+			    XmNvalue,		rangec,
 			    XmNeditable,	true,
-			    XmNcolumns,		strlen(range)+2,
+			    XmNcolumns,		strlen(rangec)+2,
 			    NULL);
   AddStaticCallback(wUserMax, XmNactivateCallback, &PltApp::DoUserMax);
   
diff --git a/PltAppOutput.cpp b/PltAppOutput.cpp
index 03a6414..f4eb105 100644
--- a/PltAppOutput.cpp
+++ b/PltAppOutput.cpp
@@ -17,6 +17,8 @@
 #include <Output.H>
 #include <XYPlotWin.H>
 
+#include <string>
+
 using std::cout;
 using std::cerr;
 using std::endl;
@@ -61,14 +63,15 @@ void PltApp::DoOutput(Widget w, XtPointer data, XtPointer) {
   XtSetSensitive(XmSelectionBoxGetChild(wGetFileName,
   		XmDIALOG_HELP_BUTTON), false);
 
-  char tempstr[Amrvis::BUFSIZE], tempfilename[Amrvis::BUFSIZE];
+  char tempfilename[Amrvis::BUFSIZE];
   if(animating2d) {
     strcpy(tempfilename, AVGlobals::StripSlashes(fileNames[currentFrame]).c_str());
   } else {
     strcpy(tempfilename, AVGlobals::StripSlashes(fileNames[0]).c_str());
   }
-  sprintf(tempstr, "%s_%s", pltAppState->CurrentDerived().c_str(), tempfilename);
-  XmTextSetString(XmSelectionBoxGetChild(wGetFileName, XmDIALOG_TEXT), tempstr);
+  std::string tempstr(pltAppState->CurrentDerived().c_str());
+  tempstr.append("_").append(tempfilename);
+  XmTextSetString(XmSelectionBoxGetChild(wGetFileName, XmDIALOG_TEXT), &tempstr[0]);
   XtManageChild(wGetFileName);
   XtPopup(XtParent(wGetFileName), XtGrabNone);
 }  // end DoOutput