diff --git a/src/wignerSymbols-cpp.cpp b/src/wignerSymbols-cpp.cpp
index db5154e..a58e58e 100644
--- a/src/wignerSymbols-cpp.cpp
+++ b/src/wignerSymbols-cpp.cpp
@@ -223,7 +223,7 @@ double wigner3j(double l1, double l2, double l3,
 	double l1min = std::max(std::fabs(l2-l3),std::fabs(m1));
 
 	// We fetch the proper value in the array.
-	int index = (int)l1-l1min;
+	int index = (int)(l1-l1min);
 
 	return wigner3j(l2,l3,m1,m2,m3)[index];
 }
@@ -448,7 +448,7 @@ double wigner6j(double l1, double l2, double l3,
 
 	// We compute l1min and the position of the array we will want.
 	double l1min = std::max(std::fabs(l2-l3),std::fabs(l5-l6));
-	int index = (int)l1-l1min;
+	int index = (int)(l1-l1min);
 
 	return wigner6j(l2,l3,l4,l5,l6)[index];
 }
diff --git a/src/wignerSymbols-fortran.cpp b/src/wignerSymbols-fortran.cpp
index 34e503b..14b3602 100644
--- a/src/wignerSymbols-fortran.cpp
+++ b/src/wignerSymbols-fortran.cpp
@@ -62,7 +62,7 @@ double wigner3j_f(double l1, double l2, double l3,
   drc3jj_wrap(l2,l3,m2,m3,&l1min,&l1max,thrcof,size,&ierr);
 
   // We fetch and return the value with the proper l1 value.
-  int index = (int)l1-l1min;
+  int index = (int)(l1-l1min);
   return thrcof[index];
 }
 
@@ -102,7 +102,7 @@ double wigner6j_f(double l1, double l2, double l3,
   drc6j_wrap(l2,l3,l4,l5,l6,&l1min,&l1max,sixcof,size,&ierr);
 
   // We fetch and return the coefficient with the proper l1 value.
-  int index = (int)l1-l1min;
+  int index = (int)(l1-l1min);
   return sixcof[index];
 }
 }