diff --git a/src/quality.c b/src/quality.c
index be9193d..48b58f2 100755
--- a/src/quality.c
+++ b/src/quality.c
@@ -222,7 +222,8 @@ int runqual(long *t)
    long    hydtime;       /* Hydraulic solution time */
    long    hydstep;       /* Hydraulic time step     */
    int     errcode = 0;
-
+   int i;
+  
    /* Update reported simulation time */
    *t = Qtime;
 
@@ -240,7 +241,7 @@ int runqual(long *t)
           QTankVolumes[i-1] = Tank[i].V;
         }
         
-        for (int i=1; i<= Nlinks; ++i)
+        for (i=1; i<= Nlinks; ++i)
         {
           if (LinkStatus[i] <= CLOSED) {
             QLinkFlow[i-1] = Q[i];
@@ -251,11 +252,11 @@ int runqual(long *t)
    }
    else {
         // stepwise calculation
-        for (int i=1; i<= Ntanks; ++i) {
+        for (i=1; i<= Ntanks; ++i) {
           QTankVolumes[i-1] = Tank[i].V;
         }
         
-        for (int i=1; i<= Nlinks; ++i)
+        for (i=1; i<= Nlinks; ++i)
         {
           if (LinkStatus[i] <= CLOSED) {
             QLinkFlow[i-1] = Q[i];
@@ -281,7 +282,7 @@ int nextqual(long *tstep)
 {
    long    hydstep;       /* Hydraulic solution time step */
    int     errcode = 0;
-
+   int i;
    /* Determine time step */
    *tstep = 0;
   
@@ -302,7 +303,7 @@ int nextqual(long *tstep)
     }
     
     // restore the previous step's tank volumes
-    for (int i=1; i<=Ntanks; i++) {
+    for (i=1; i<=Ntanks; i++) {
       if (Tank[i].A != 0) { // skip reservoirs again
         int n = Tank[i].Node;
         Tank[i].V = QTankVolumes[i-1];
@@ -311,7 +312,7 @@ int nextqual(long *tstep)
     }
     
     // restore the previous step's pipe link flows
-    for (int i=1; i<=Nlinks; i++) {
+    for (i=1; i<=Nlinks; i++) {
       if (LinkStatus[i] <= CLOSED) {
         Q[i] = 0.0;
       }
@@ -332,7 +333,7 @@ int nextqual(long *tstep)
   
   // restore tank levels to post-runH state, if needed.
   if (OpenHflag) {
-    for (int i=1; i<=Ntanks; i++) {
+    for (i=1; i<=Ntanks; i++) {
       if (Tank[i].A != 0) { // skip reservoirs again
         int n = Tank[i].Node;
         Tank[i].V = tankVolumes[i-1];
@@ -340,7 +341,7 @@ int nextqual(long *tstep)
       }
     }
     
-    for (int i=1; i<=Nlinks; ++i) {
+    for (i=1; i<=Nlinks; ++i) {
       if (LinkStatus[i] <= CLOSED) {
         Q[i] = QLinkFlow[i-1];
       }