diff --git a/libacc/acc.cpp b/libacc/acc.cpp
index a74f51d..823849c 100644
--- a/libacc/acc.cpp
+++ b/libacc/acc.cpp
@@ -3188,6 +3188,7 @@
     static const int TOK_NUM = 2;
     static const int TOK_NUM_FLOAT = 3;
     static const int TOK_NUM_DOUBLE = 4;
+    static const int TOK_OP_ASSIGNMENT = 5;
 
     // 3..255 are character and/or operators
 
@@ -3626,6 +3627,13 @@
                             inp();
                             tok = TOK_DUMMY; /* dummy token for double tokens */
                         }
+                        /* check for op=, valid for * / % + - << >> & ^ | */
+                        if (ch == '=' &&
+                                ((tokl >= 1 && tokl <= 3)
+                                        || tokl >=6 && tokl <= 8) ) {
+                            inp();
+                            tok = TOK_OP_ASSIGNMENT;
+                        }
                         break;
                     }
                     opIndex++;
@@ -3797,6 +3805,17 @@
             expr();
             pGen->forceR0RVal();
             pGen->storeR0ToTOS();
+        } else if (tok == TOK_OP_ASSIGNMENT) {
+            int t = tokc;
+            next();
+            checkLVal();
+            pGen->pushR0();
+            pGen->forceR0RVal();
+            pGen->pushR0();
+            expr();
+            pGen->forceR0RVal();
+            pGen->genOp(t);
+            pGen->storeR0ToTOS();
         }
     }
 
diff --git a/libacc/tests/data/assignmentop.c b/libacc/tests/data/assignmentop.c
new file mode 100644
index 0000000..10b4637
--- /dev/null
+++ b/libacc/tests/data/assignmentop.c
@@ -0,0 +1,66 @@
+// Test assignment operations
+
+void testAssignment() {
+    int a = 2;
+    a *= 5;
+    printf("2 *= 5  %d\n", a);
+    a = 20;
+    a /= 5;
+    printf("20 /= 5  %d\n", a);
+    a = 17;
+    a %= 5;
+    printf("17 %%= 5  %d\n", a);
+    a = 17;
+    a += 5;
+    printf("17 += 5  %d\n", a);
+    a = 17;
+    a-=5;
+    printf("17 -= 5  %d\n", a);
+    a = 17;
+    a<<=1;
+    printf("17<<= 1  %d\n", a);
+    a = 17;
+    a>>=1;
+    printf("17>>= 1  %d\n", a);
+    a = 17;
+    a&=1;
+    printf("17&= 1  %d\n", a);
+    a = 17;
+    a^=1;
+    printf("17^= 1  %d\n", a);
+    a = 16;
+    a^=1;
+    printf("16|= 1  %d\n", a);
+}
+
+/* Can't use because int* f() is not parsed as a function decl.
+int a;
+
+int* f() {
+    printf("f()\n");
+    return &a;
+}
+
+void testEval() {
+    a = 0;
+    printf("*f() = *f() + 10;");
+    *f() = *f() + 10;
+    printf("a = %d\n", a);
+}
+
+void testOpEval() {
+    a = 0;
+    printf("*f() += 10;");
+    *f() += 10;
+    printf("a = %d\n", a);
+}
+
+*/
+int main() {
+    testAssignment();
+    /*
+    testEval();
+    testOpEval();
+    */
+    return 0;
+}
diff --git a/libacc/tests/test.py b/libacc/tests/test.py
index f9089be..239bb9b 100644
--- a/libacc/tests/test.py
+++ b/libacc/tests/test.py
@@ -340,6 +340,20 @@
 a = 2, *pa = 2 **ppa = 2
 """)
 
+    def testassignmentop(self):
+        self.compileCheck(["-R", "data/assignmentop.c"], """Executing compiled code:
+result: 0""", """2 *= 5  10
+20 /= 5  4
+17 %= 5  2
+17 += 5  22
+17 -= 5  12
+17<<= 1  34
+17>>= 1  8
+17&= 1  1
+17^= 1  16
+16|= 1  17
+""")
+
 if __name__ == '__main__':
     if not outputCanRun():
         print "Many tests are expected to fail, because acc is not a 32-bit x86 Linux executable."